BG3 is very much built on Larian’s sensibilities and design choices from DOS1 and 2. It’s a lot more polished and evolved, but it is clearly just as much a successor to those games as it is to BG. I really enjoyed DOS2 especially, but based on my experience with EA I’d say easily say BG3 is a much better game.
I’d say just wait on reviews and maybe buy it after launch on Steam where you at least have a couple of hours to refund it if it isn’t working for you.