Can't we just enjoy this as a game on it's own rather than overzealously comparing it to it's predecessors? I fear the die-hard Baldur's Gate fans will downvote BG3 into oblivion because it may not fully align with what they expect from a Baldur's Gate game. Larian Studios is currently the biggest(?) studio that creates RPG's like this at the moment and toppling this studio just because BG3 isn't close enough to it's predecessors will only hurt the genre as a whole.
The only reason I bought and even came across games like Pillars of Eternity and Pathfinder: Kingmaker is because DoS lured me into the genre and I can imagine a whole bunch of people bought those games with a similar backstory as mine. I would say the successes these games brought is something this genre desperately needed, as it's not just Larian Studios profiting from it but other studios as well and this opens up the possibility of new studios popping up to create games in this genre because of it's successes.
I'm not saying that the entire genre dies out if Baldur's Gate 3 fails to deliver, but it certainly doesn't help as we're not exactly swamped with choices in this genre in the first place.
This situation is in a way comparable to how the Zelda games evolved from NES to current-gen, even if I don't enjoy the newer games as much as I did the one's on (S)NES, they're still good games on their own and rightfully so have earned their stripes.
Fear not, this game will be a massive success.
It carries the name of one of the most important franchises in crpg and probably has the biggest budget in IE-like games, so naturally expectations are high.
