I just don't see how having to consult a spread sheet or spend hours "researching" options for a NPC character to build them correctly for your party is fun! The most fun I have had with RPGs were DOS 1, Witcher series and Horizon Zero Dawn and (most recently).
I like the idea of multi-class, certainly for your main character but if other NPC party members had that it would be fun also.
I guess we all want different things, I want fun without the spread sheets others want a "challenge", its possibly for both to have that without the headaches. its called "easy", "normal" and "hard" or you can add "super hard" for those uber RPG players among us.
The main thing is for things to be "common sense", yes you would need to know some basics of the class, when to take wisdom over intellect as an example.
well, this is all fun to discuss but in the end Larian will do what Larian does.
Oh, one other thing Larian, STOP REINVENTING THE INVENTORY AND CRAFTING SYSTEM's!!!