Well, to be brutally honest here, as long as the reviews on Steam and GoG are positive, Larian is going to assume that most of the player base approve of the changes. This goes for pretty much anything, so if your unhappy, revisit your review. If the reviews start trending negative, Larian might start taking the forums seriously.
That's exactly the point. Most reviews are positive, because all BG3 players are videogamers ( by definition ), while relatively few play TT D&D ( I don't, for example ).
The 5e rules are exactly what TT players wanted them to be, due to significant consultation after the blowback from the drastic 4e changes. But since the rejected 4e rules were designed to align better with videogame norms, that also means that 5e rules are less well suited to creating an appealing videogame for those that don't play TT.
Most of the changes Larian are making seem to be aimed at increasing the tempo of combat rounds, and increasing the impact of what a player can do when it's their turn, which is in line with what most people buying the game will probably prefer. I really hope that when the game is finally released there is a "strict" D&D mode for the TT players that want it, but I entirely understand why that is not the mode used for Early Access testing, since it is a minority preference.
Anyone that doesn't like what Larian are doing should still give direct and indirect feedback so that they know there are dissenters to consider, but no-one should expect their comments to necessarily result in change, particularly to the one/only game mode in Early Access.
Feedback is also likely to be more impactful if rendered politely, lucidly and logically, which seems to be beyone some people at times.