I also disagree about feedback. Larian has been responding to feedback - throughout EA and up to 1.0 and after release. They didn't change the game they are making, simply because some playerbase didn't like what they were going on, but they did address criticisms that they found valid. Early Access is a testing ground, not a design committee.
I am mostly surprised you thought Early Access wasn't beneficial. In both of their titles I played (D:OS2, BG3) I thought the opening chapter, which was extensively tested throughout EA period has been the best, most polished and robust part of the title by a large margin. Would BG3 be really better, if whole of the game was as messy as act2&3?
Now, that there is sizable gap in quiality in IMO a concern in itself. It seems like Larian has tendency to overscope to start with, and is unable to keep up with the standard they set at the start of their titles. To me it is not great, and I find all three of their recent RPGs to be disappointing - and they are disappointing mainly due to the expectations they set up for themselves. I have no clue what they should do, or if there is a problem to begin with. Complex RPG as simply difficult to test, and testing part of it, and spending time fixing the rest post release, seems like a fairly decent way of doing it. It seems like a happy medium between releasing whole game in Early Access, and releasing game with only internal testing, and than fixing the whole thing post release.
They seem to listen rather selectively, mostly commiting to enabling what is essentially a bug (the whole Minthara debacle) and making less and less content exclusive, practically killing replayability. Why even bother with the Absolute's route if you can get Minthara anyway? It's simply a "wrong" choice that you are punished for, rather than a road for an alternate narrative.
People have also been asking for dice rolls for abilities since Day 1, and for at least the full roster of basic combat actions to be implemented, and yet we got neither of those. People have been pointing out how Disguise Self shouldn't just let you access the "small" tag for interactions because your physicality doesn't change, only your appearance since it's an illusion spell. People have been complaining how Mage Hand doesn't do what it's intended for, making it pointless for most of the puzzle-solving. People were confused where the fishermen from the nautiloid went. People were annoyed about the grove attack taking place in broad daylight.
Act 1 is nowhere near as "polished" as it should have been, all things considered. It's as awkward and janky as the rest of the game. And as far as their previous titles go, I actually think that it's the midgame that's the strongest in both of them, since that's when they really open up and you have most of your toolkit available. Lategame is a mixed bag, but I enjoyed it in both of them, whereas BG3's was a big slog that made the plot stop dead in its tracks, and it was already severely gimped by the Emperor's reveal.