I would love to know these changes too, and if possible, having them limited to the strict minimum.
Finally having a 5e videogame is awesome, but then seeing how heavily modified the ruleset is, to the point of changing weapons/spells damage and changing the whole mechanics by altering what is an action and what is a bonus action (thinking of disengage, for example) is kind of a let down. I totally understand that some changes need to be done (and I'm used to dnd based videogames, having the game turn based alone make BG3 way better than any of them), but the feeling I have in my second night of playing is that those changes are way too liberal.
Which doesn't make the game bad, obviously. I've enjoyed it a lot, so far.