Personally I have more of a problem with all classes having access to all scrolls and believe it to be the bigger contributor to over all watering down of class "distinctiveness". Bonus action potions in a normal D&D game is apparently a popular homebrew and doesn't seem to break the game by itself.
That said BG3 is NOT a normal D&D game on far to many levels. All of Larian's homebrew stacks creating something way out of proportion to the slight change it appears to be. Between potions becoming bonus actions, plus now being Healing Word for all classes, plus new magic items apparently giving extra bonus actions out like candy and full access to spell scrolls on top of all that it is just to much extra healing power imo. Not just does it lessen/eliminate to some extent the cleric class, but I believe in Larian's mind it justifies/encourages their other homebrew decisions like giving creatures aoe abilities they shouldn't have.
I do agree with GM4Him's fear the later game is potentially going to be problematic.