I'm not making excuses, I'm just saying that Larian deserves to get a free pass on this one for releasing a game that exceeded the already high expectations, not for the demand. And personally, I barely encoutered any bugs in a 90 hour long save...

As for them "already having 5e", that's true, but it's a system that is rather complex and which only gets more complex with higher in-game levels and items which all slightly modify the game - which is easy on tabletop, but I can only imagine what a nightmare it must be to implement this in a computer game. And as far as I know, there aren't any other computer games that truly implement 5e. Sure, there's Solasta, but that's highly modified.

As for the engine: I really don't see it as a valid point, as they had to massively change and upgrade it between D:OS2 and BG3 anyway, it's just too different.