My honest belief was they really wanted to get this right by the fans, and in doing so bit off more than they could really chew. But if they would have just resolved the war, we would have heard screaming they were just recycling what they were going to do with EM, which would have been true to an extent, but it would have had the virtue of not having to try and build a bridge from both ends, hoping it meets in the middle.
How this connects to the race select, if course, is in the priorities they thought they needed vs player feedback. If they'd had them from the outset, I think we would have had much greater interaction (ex. A dwarf might get a bonus quest with Varric to deal with Merchant Guild stuff. Guild being worried about the whole Herald thing.) I don't think they should try to do origins anymore, at least not like in DAO, but have quests etc that come up because you are so and so background.
Clearly the devs went an extra mile to try and give the fans what they wanted, and should be commended for that, but it clearly came at a cost and we, as fans, should be careful about what we ask for because every extra thing we ask for that they add likely means something else has to be cut or scaled back to accommodate it. I'm sure that if there had only been the human inquisitor, there would have been more backstory interaction that what we got in the final game, but it had to go to accommodate the race options. It would also explain why the level of interactivity with race choice has minimal bearing on the actual story.
While I would personally like "Origins", or at least some sort of character introduction prologue, I also think they could take a cue from Mass Effect by allowing the player to select a couple of key background points to flesh out the character's backstory (like the Earthborn, Sole Survivor, etc.) and then have those tie back into dialogue and into some side quests later on, to give further opportunity to fill in the background. The problem with the Inquisitor was that you started with minimal background context (one sentence about why your character was at the Conclave doesn't really cut it), and barring a couple of lines of dialogue, it is never really addressed again and you are just left to headcanon something (or not). I really wish Inquisition started with showing how your character came to be in attendance at the Conclave, had you encounter other characters your character was with at the conclave, and then had it all blow up on you. As it was, everything blows up and everyone dies, but you don't really know anything about anyone who died so it gives you no reason to care. If we had met some characters as part of the backstory, it would have given the explosion a bit more weight.
As for DAI's plotlines, i would have been fine if DAI had simply resolved the Mage/Templar War and Orlesian Civil War without any Corypheus or rifts or whatever. I felt fairly let down at how perfunctory the resolution of both conflicts, which were so well set up by DA2 and the books, was and the lack of ties to those books (no Rhys and Evangeline on screen, minimal Michel de Chevin for example).
In some ways, these problems sort of encapsulate my main issues with Inquisition overall; the ideas are all there, but the execution is just a bit lacking and many elements feel like major missed opportunities. I really feel that if they had spent a bit less time making sandboxes for people to potter around in and spent more time fleshing out the main story, it could have been amazing rather than just pretty good.