I would even say that without EA all 3 acts would likely have been good as Larian would not have wasted so much time rewriting the story and characters to whatever the most vocal EA players wanted. And without the rewrites and intact artistic vision BG3 would be a much better experienced than the mess we have now where so many things do not fit together because of rewrites.
Well, even if bg3 was a mess, it would be a universally and critically acclaimed mess

Sure thing a considerable portion of earlier feedback was focused towards a limited, ever-changing portion of the game. I think a competent developer can easily discern feedback by its quality and applicability.
However, the feedback itself can be deeply flawed and misdirected if it's been gathered from an access to an incomplete version of the game. I can't see why any developer would want to overcomplicate its routine work by gathering sub-optimal feedback, reassessing its worth in the context of the full game, then discerning it based on technical and other factors.