I thought Origins did it pretty well too.
But I think a big part of the problem with Inquisition, for me thus far anyway, is just how much of a gap there is in the presentation of the story between your main story quests and everything else. The companion quests and main story quests have the usual BioWare cinematic presentation and approach but just about everything else is about as generic, bare bones MMO look as you can possibly get- from the generic side quests in the world being almost devoid of any story or narrative outside of what you find in notes to the way those conversations are barely framed in any sort of zoomed in cinematic view.
I think that's a big part of the reason the main story stuff feels so insignificant is because if you're grinding away on the overload of Ubisoft style fetch quests out in the world, that's a huge chunk of your play time compared to the story heavy stuff, which usually the meat and potatoes of a BioWare game. With Origins, you went to each area with the main purpose of pushing the main story forward and every NPC interaction got you the zoomed in camera for conversations, so they all felt somewhat engaging. Whereas with Inquisition, half of the time you're talking to someone its in that bland over the shoulder view that glitches out most of the time and it just kills my interest in those conversations when you have either your party members running around like idiots stuck on the geometry in the background or the NPC you're talking to is facing the wrong way. It makes it feel like a really cheap MMO, not a proper modern BioWare game.
I agree, I actually burned out pretty fast from the tertiary stuff (shards, rifts, requisitions etc.) and decided to strictly do the "main" sidequest in each area for worthwhile rewards (agents, power, judgement etc.) and while I'm actually pretty happy with the game (Goty here) I have to recognize the shortness of the main story has pretty much caught me off guard.
I'm ok with the design and with the fact that there's lots to do because like everything else, it's optional, you can stay for 15 hours on the Hinterlands or go pretty much straight away, you can romance someone or you can pass, you can spend 100+ hours in one playthrough or play it almost like any other BioWare game and just go through the main quests. The problem is that such a short main storyline as this feels lacking, almost every other BioWare game hits nearly 30 hours in a normal playthrough. I'm ok with 100 hours of content but please, give me at least those 30 hours of meat and potatoes or else it will feel short, at least for me, I play these games for the story.
I know this game represents a very big change of direction, one which is very positive for the most part but I hope next time they put more emphasis on the core content, the game falls short of two more main missions IMO, even if it has significant replay value.