In 5e, it seems to me that multiclassing is something they allow simply because "we might as well toss in a line that it's allowed so people don't ask about it so much, and they might as well have the choice", but you're recognizably not *meant* to multiclass, and are almost always better off if you don't.
In BG3 that feels largely reversed. Like multiclassing is not only allowed, and not only encouraged, but *intended* and straight up better than single classing, and you're probably better off doing it than not.
