The one common thread between all the D&D RPGs ever licensed (with the exception of the action titles) is the offer of an authentic rules edition experience within a computer game. The reason why the 5e crowd is so upset is that Larian does not seem to be making a real effort to deliver that. And I too want to play BG3 under 5e rules, not D:OS 3 cleverly skinned as BG3.
We have to make up our minds... BG3 is just a random custom campaign with custom rules inspired by 5e in a custom world inspired by the FR...
It's absolutely not a consistent 5e game or an epic journey in a consistent world like BG were.
It's just another (cool) Larian game... and nothing more.