Let's say I like to make my character as efficient and powerful as possible. With these new rules in place I would now being basically forced to do some broken multiclass combo OR to pretend these rules don't exist and put a restrain on myself.
I could listen other 50 examples of this type, eventually even focused on "roleplay" if the rebuttal is going to be that "power playing is a dirty word to begin with. Because that area is going to be affected as well.
I'm afraid you may live in a sheltered environment in the table-top world, because that happens in TT as well. I mean, 95% of Paladin's have sworn themselves to an evil weapon from the Shadowfell. The Hexblade/Paladin/Divine Soul is exactly the same sort of multiclass combo that people will be making in BG3.
In the TT world you can ban combos like that, but at the end of the day those bans are just as much homebrew and self limitation that you would need to do if you want to curate your experience in BG3.
