We all wanted Morrigan to appear once again in DAI, didn't we?
No, we did not "all" want that. Why is it SO hard for people to understand that not everyone wants the same thing in these games, plays the games the same way, gets the same type of enjoyment from these games, and on and on with fifty different personal preferences.
There is not a SINGLE thing in the entire universe that EVERYONE agrees on. Nothing. Nada. Zip. Zilch.
Sorry if my response seems out of proportion when you were just trying to make a point. But I am sick to death of people on these forums presuming to speaking for every single player of these games, or of talking about their own opinion or personal preference as some universal truth.
As for Morrigan specifically, on my second (with meta knowledge) and all successive DAO plays afterward I used her as a tool to ensure my Warden's survival. I don't really care one way or the other about her, or the Old God Baby (Kieran), or the new Mythal thing (if you allow her to drink), or any of that. I would not have cared one whit if she hadn't been in DAI. However, I didn't mind her presentation in DAI, and I did like what her presence brought to the story in that case. I did think it was plausible for the circumstances. And I will admit to quite a bit of excitement when I recognized Claudia Black's voice on the very first DAI E3 trailer.
Do I have some burning need to check up on her in every installment, and also perhaps see the child that I forced Alistair to conceive? No, I don't. But if she comes along anyway, that's fine too.
Problems come when characters overstay their welcome because they need to be available as part of the fighting group at all times. How much content needs to be created just to prepare for the fact that any of your 6-10 companions can be present at any time in any quest? How much party banter? How many reaction phrases to say during key plot points? How many side quests just to give character development to every single NPC? How many interactions between companions at your base, to let you see that you are leading a real group of people? Not to mention the fact that everyone needs to have an opinion about every choice you make and let you know.
Uhm, no? There are many quests and plot points where the various followers don't say anything at all or offer an opinion (no, I'm not counting approval points). There are some quests and plots where only certain followers will say something. And yes, there are some where the player has the opportunity to hear from everyone, such as with the Well choice. If anything, there have been numerous complaints on these forums from players who want even more reactivity from followers, about everything.
Ok, Bioware has great writers, but I'm sure that they would work much better if they weren't forced to write complete story arcs, party banter, reaction phrases and so on for each and everyone of your companions (and Advisors, in DAI).
How about they're making the game they want to make, the way they want to make it? You seem to be under the impression that they sit around the writers pit bemoaning the fact that they have all of these followers to write, when all they really want is to focus on a juicy plot for the player protagonist. But they enjoy writing the followers too, you know.
This allows them focus on meaningful content, without being forced to fill up the holes with uninspired stuff.
Again, that is your own opinion. Many players greatly enjoy all of the companion content, some want even more, and there are others that want certain companions to be an integral part of the plot in addition to the current amount of content they already have as a companion.
For myself, I will say that the amount of follower content we got in DAI is just enough for me. Perhaps the only things I would change would be to have the addition of (a very few, easily located) banter trigger points out in the world, while still keeping the banter system as it was, and fully cinematic base conversations (I don't need these for every NPC, but followers, yes). There might be more, but those are the two main issues I had with followers in DAI.