Many of the deviations from the DnD rulse that Larian added make me think, that they don't understand some of the DnD rules and why they are needed for a somewhat balanced game.
The other explanation would be they think they can reblance the whole system of 600+ ability and spells from the ground up... so its either way... the result is quite underwhelming so far. Naturally that's just my opinion and everything about BG3 implementation is great.