I think you played a different game to me, because my copy of the game never expected me to care about Justinia or the people in the conclave.
It never acted like Justinia should have been a great loss for my character, or like I should have taken the deaths at the conclave personally. You didn't start leading the Inquisition because of her (I mean, I guess you could choose to role-play that if you really wanted to), you lead the Inquisition because of numerous factions wanting you dead and you needing their protection. You can add some generic reason about caring for random strangers if you really want to, but the plot never demands it. I spent the entire game saying "F the chantry", but that doesn't mean I'm going to turn down the best chance I have of not being murdered by an ancient god or devoured by my own hand.
Yes, I must have received the non-sociopath Inquisitor version.
And yet you're arguing that it's logical for the Herald to accept being Inquisitor because it's the best chance to not be murdered, but it doesn't make sense for the Warden to try to unite the land so that they don't die in a Blight? At the very least, if the Warden decided to skip town (which is almost impossible since Loghain's soldiers are on the look out for us at every border to Ferelden) we would just be sentencing Ferelden to doom and spending the rest of our life in some other country hoping the Blight is stopped before it reaches us. And we barely have any money when we leave Ostagar, how are we going to realistically leave Ferelden and start a new life somewhere else? We're going to be a refugee in Darktown?
You don't need to know who Justinia is, and I don't think it would have worked better in the fade if you did - I actually think it would needlessly complicate what that scene is trying to accomplish. It presents you with both a mundane and divine explanation for your situation, and it says a lot about your character about which explanation they choose to believe. If you know Justinia, than it's no longer about that, because now you want it to really be her for different reasons. The game is about faith, and this scene is vital to that theme. Simply meeting a character you might not want to be dead doesn't further that theme.
Why would having met Justinia mean we want the presence in the Fade to be her? Maybe we liked her a lot and don't want her spirit wandering the Fade but rather be at the Maker's side. Maybe we didn't like her and don't want to have to talk to her again. Maybe we believe it's really her and that upsets our personal faith, whatever that is.
Your argument seems to rely on needing the game to start with people you have a personal connection to dying to motivate you. Which is a fine motivation, and can be used well, but it's not the only motivation that must be used to start a game and must be featured in every game ever. There are a billion stories that don't start with that plot, and Inquisition is one of them. It's only an issue when the game expects you to care - which the game never did. It gave you other things you were supposed to care about. I'm not sure why you keep claiming you should care, since that's not supported in the game.
Our motivations don't need to rely on having a personal connection, but it would be nice if that were an option. Right now, it's about self preservation or Wanting To Do The Right Thing. And from the player's perspective, the only real reason we're doing anything is because we're confused about what's going on and trying to find out what the PC was doing before the start of the game. We can't realistically RP motivation because we the player don't know what the PC knows about the Conclave. It's a disconnect between the player and the PC.
I cared about Jowen and Lily in the Origin. Then they both got taken away and I had nothing else to care about. After the Origin, they were both most likely dead, so how would stopping the Blight help them? Whilst in Inquisition, I did have a personal connection to the plot and a reason to care.
Jowan didn't get taken away, he clearly escaped. He is on the run from templars but there's no reason to assume he's dead. Which turns out to be true, since he's alive and "well" in Redcliffe.
But even if those two were dead by the end of the origin (and only the HN actually has everyone they care about dead, except for Fergus) why would that mean that the PC automatically doesn't want to save the other people in the tower? If my best friend died, I would not want the rest of the world to burn. Maybe in a moment of grief and rage, but not beyond that.
1 - The mark was killing me. Even after this stops, there is no explanation why it stopped or whether it might start again (and it does, as we see in Trespasser) The Inquisition is the best chance of figuring out how to fix this, not just running off into the woods and hoping for the best.
2 - The Chantry has denounced me. I'm already an Elvhen apostate they would love to make Tranquil, now they think I'm impersonating a chosen one of their religion. I step outside the Inquisition, I'm dead.
3 - Cory wants me dead. I'm really going to stand a chance against an ancient undead Tevinter magister and his army by myself am I? I need the Inquisition.
After we drink darkspawn blood we start having nightmares and learn that there are side effects to being a Warden. If we abandon Ferelden, no Warden from another country is going to welcome us and give us answers about our condition. They will either execute us for desertion or send us to the front lines or Deep Roads for a quick death. So if we want to learn more about the side effects, even if we don't want to be a Grey Warden, we can't just flee Ferelden.
The Chantry is gone. They make a point that Chancellor Roderick is one of the highest remaining officials alive and he was a paper pusher for Justinia. The Chantry has no ability to do anything to us since all senior leadership is gone and the templars have gone rogue.
We don't know about Cory at the beginning. While it's true that someone was behind the explosion, it's just as likely that they died in the explosion, since we see the shadow of Cory in the Breach flashback right before we close it. Finding out who caused the Breach at the beginning of the game seems to be more a search for why it happened, not assuming that it will happen again.
4 - (Elf only) Who knows how my clan will react if I go back, whilst the humans think I'm the Herald of their religion which nearly wiped out their race. There's every chance they'll think I'm a traitor and exile me.
Since we didn't meet the clan, it's up to the player's headcanon how they would react. We could say anything to justify our reasoning. They could assume the shem were being stupid again or lying to make their Chantry look better to elves and hope to convert Dalish. There's no reason to assume the likely reaction of the clan is exile, that is one of many headcanon possibilities.
So, Inquisition gave me an entire series of motivations that didn't rely on my caring about of bunch of random strangers. Let's see what Origins gave me to care about -
All of the reasons you have provided are pure self interest. It would be nice if we had some motivations to join the Inquisition which weren't only self interest.
1 - Characters from my Origin. I liked Jowan and Lily, but Lily is taken off to prison/to be killed or whatever and Jowan is an escaped Blood Mage who is going to be killed. Stopping the Blight isn't going to help either of those people. The only other characters I had significant interaction with endorse me being imprisoned for my entire life. I have no reason to help these people.
So you can headcanon all of the people from DAI's background we've never met and care about them, but you can't headcanon anyone from the origins outside of the few we see? Did your mage Warden not interact with anyone in the Circle but Jowan, Lily, the First Enchanter and the templars?
2 - Generic "save the Ferelden" motivation. They locked me up, and I've never met any of them. Don't care.
This is your roleplaying interpretation of one origin. Many of the other origins had families we left behind who would be killed by the Blight. You're using selective examples as justification for the entire origin system. I could also have a mage Warden who was glad to have been in the Circle and learn to control my powers, and was eager to see the world now that I was out.
3 - Care about the Gray Wardens? I knew 2 wardens for an hour half of an hour. They were both cool with forcing me to drink undead monster blood that will slowly poisoned me for the rest of my now much shorter life. I have every motivation to get the hell away from these people.
I have no interest in playing the ES or other open world RPGs. If you read my posts, my entire issue is a lack of character motivation, ES is even worse about these things. It also doesn't have tactical gameplay, or interesting characters for me to get to know. Those games have nothing I enjoy in them.
How exactly am I holding Origins and Inquisition to different standards? One gave me personal motivation, one stripped it away and expected me to still care. I am holding them to exactly the same criteria here.
As I mention above, the PC doesn't have to care about the GW, but they could RP as curious about what the Joining did to their body and what's going to happen to them down the road. And in most instances, if we just abandon the GW mission and go back home, we will land in a jail cell or be killed. We can't go home at this point.
It seems like you don't think you can create PC motivations in DAO because there is more background material to work with. I don't see why that is the case. Just because we interact with our family or friends doesn't mean that limits the motivations of the character. And it seems like you're holding the games to different standards because a lot of the arguments you make in favor of DAI are the exact same arguments you make against DAO.