My theory: With respect to all the discussion about BG3 rules and mechanics, and all of Larian's changes to them, I believe they are because WotC has decided the game needs to be based on OneDnD (or 5.5e or 6e or whatever name they eventually come up with) rather than 5e.
Yes, I've thought of that too, since it makes sense in the long run instead of, say, BG 3 with 5e and a future BG 4 with One DnD. At least I have the feeling that Larian is in a transition phase here and if they prepare their coding properly, if this is at all possible, BG 3 DLCs then only have to adapt slightly.
My guess is that seeing how BG3 performs will inform decisions being made about OneDnD.
This may as well be the case.
