I was already given tasks to do in the main story that opened up a path to the next portion of the main story. So there is no need to do busywork to progress.
Game objectives:
Meet Giselle- Giselle suggests meeting with the Chantry in VR
End result: The chantry doesn't care about the busy work you did in the Hinterlands anyway.
Objectives: Meet the Templars or Mages- gather noble influence to meet Templars.
First of all, Why do I need power points to pick the mages? Alexius obviously wants to meet with me for his plan to take place so why would I need to build power for this meeting?
As for the Templars, why couldn't I have just done some of the war table missions involving nobles to unlock Abernache? Does Abernache look like the type who cares if I picked up some piece of garbage on the road and followed it's instructions? Mind you, when I say do war table missions, I mean make those war table missions actual quests not just pick ABC and wait for a timer to run out.
Picked Mages or Templars and closed breach- Haven attacked. Good thing they understand that it shouldn't cost me power points.
Cory attacks Haven and reveals to the world that he is a threat, There is red lyruim growing everywhere, and we have Mages or Templars (both actually) running around slaughtering people, as we are told, we get Skyhold, Meet Hawke, and told to meet him secretly in Crestwood.
Yet I have to use power points to unlock Crestwood....really? For a secret meeting with Hawke and a GW no one knows is there?
Now I'm told I need to confront the GWs who are doing something evilz in the Western Approach. Yet I need power to unlock a desert wasteland? To stop a bunch of Wardens who are endangering the world? Really?
Then the bad guy has run off with a possible demon army, the Inquisition has siege weapons and soldiers already, yet...we cannot possibly go after this guy and stop him from raising a demon army because......?
So we stopped the demon army and saved the day...for the moment...yet, the Inquisitor can't set up a simple camp with two people in an area unless he....performs some fetch quests?
I get a letter from a guy who says he has information but I can't just go in with a spy team to see him? I need to set up camps and take over the area? Assuming I give two craps about his information to waste time doing it.
Tell me, why do I need power to unlock the Winter Palace when I was already given an invitation?
Oh my goodness, you cannot possibly argue that this isn't anything other than pointless gating that has no relevance to the progression of the story. The only one I can see where the influence and power cost matter is meeting the Templars. Which is why I argue that we should have been given actual quests from the war table to do.
How do you think the Wardens were capable of approaching the leaders of the respective factions? They had the authority of the treaties.
We also had treaties! Fake ones, but they (nobles) believed they were real which meant that we could have bypassed all the busywork from nearly the start of the freaking game once we had Blackwall.
The gating itself is hardly difficult to overcome. You only need to complete two or three zones to be able to unlock everything, assuming you do the companion quests, the occasional war table quest, plunder the occasional tomb, and slay the occasional dragon. Even the main quests have refunds on power.
The difficulty is not the issue, it's the fact that it's irrelevance pretending to be relevant.
At this point you're complaining that you're playing the game itself. Expecting anyone to believe that you heavily dislike doing anything but the main quest in DAI that you can't even do a couple of missions on the side is an insult to any DA fan's intelligence. This is probably the dumbest argument in this thread.
I'm criticizing the game mechanics and story. Which is what you do with any game you play that you have an issue with...ya know...criticize the presented content. Yes, I am insulting your intelligence as a fan by not liking the side content presented to me and expressing why I don't like it. You know, me not liking a portion of this game has nothing at all to do with you. Please get over yourself. 
Random? The wizard and the talking tree are main quest NPCs and not random NPCs. Ruck is a side character that is hardly any more prominent than Michel or Sutherland even. Random graves? There's an entire graveyard in the Exalted Plains. No not just the elven graves, the actual dead people scattered in the zone.
I'm referring to how these NPCs stand out and enrich the overall world. They had interesting content. As for the tree and the Wizard, they do gate the entrance to the rest of the forest, but you do have an option in how you handle them both. Yes DAI has graves in a graveyard and undead enemies et al. But none of it was interesting. I liked the campfire encounter in DAO. But I don't expect them to redo that in DAI. Aside from Abernache, the Avvar Chief, and Barris, I didn't find many of the side characters interesting.
This "lack of life" excuse that you are so eager to toss around is merely a reflection of your incapability of imagining a character operating in an open world.
Oh yes, the "You can't role play" excuse. I would have a drinking game to how many times you and others would use that as an argument, but I'd probably die of alcohol poisoning.
I'm fully capable of head canoning my character. As a matter of fact my head canon is completely different than what the game itself gave me. But I recognize that it is nothing but head canon. If I'm given vanilla ice cream, I can imagine sprinkles on it, but that doesn't mean sprinkles are actually on it.