I can't comment on all the specifics that were mentioned in this thread, but I strongly support the general message of sticking to the 5e rule set. It would be amazing if I could go over my player handbook "design" a character and be able to create it in-game with little to no difference.
The feeling of the game is important. I want to feel like I'm playing D&D (and or classic Baldur's Gate). They're already having some issues with the fact that the game feels too much like DOS for a lot of people (I also think it's not the best business decision since they're relaying on the same audience rather then expend it by providing a 2 different experiences).
But.. I'm enjoying myself currently, and I trust Larian to provide a great game even if it won't match my "vision" of it.