If you're gonna break it down by the numbers I won't argue with the part about which game technically had more filler. But if people are walking away from DA:O with smiles on their faces, and the same people are walking away from DA:I complaining too much about how side content overtook the main story, then something is wrong, and it was how it was all presented. I mean you can't just say "Well according to my calculations, DA:I is mathematically the better way for them to present their games", because human beings aren't that simple. That's just not a real proper way to try and evoke a positive emotional response from them. So number crunching aside, if a lot of fans are being very vocal about ME:A not being like DA:I, then DA:I shouldn't be how they present their future games.
That said, it took me 50 hours to pretty much 100% DA:O, but it took much longer to 100% DA:I. And I know for a fact I spent more time doing main story content in DA:O than I did DA:I. So whatever numbers you want to crunch is fine with me, I won't tell you you're wrong. But I'm saying from my personal experience, I don't feel the same way you do.
I've said this before, no you didn't spend more time on the main quest in DAO. What DAO did was structure the game in such a way that all the side quest filler was largely subsumed in other activities. Think about the Roads and all the crap collection and side quests down there. The thing is that you were doing all that in order to "unlock" the Branka part but you did that merely by slogging through a lot of tedious trash mob fights and topsider, asunder collection type quests.
By comparison how DAI would have handled it was to have a Deep Roads map/region filled with the asunder and other types quests that would then unlock a wholly different region that required inquisition points to go handle that would have been the Branka map.
The effect is that time wise your allocation of actual story versus side winds up being the same but the DAO methods creates the illusions on connectedness that DAI rips away. That isn't an arguement FOR DAIs structure - I preferred DAOs- but merely showing how structure can affect the perception of time.