B) Document and tutorializing the whole thing in a way that makes it actually usable, otherwise it's like borrowing a college textbook about calculus to a middle schooler.
BG3 is mainly "Anubis" (lua) and Osiris, both has pretty solid documentation already as far as scripting goes. Other engine features such as dialogue editor, quest journal etc is fair to expect to be rather straight forward and intuitive based on experience in older engines.
I have no direct experience with modding, but I know as second hand information that a lot of people in the modding community for DOS 2 had problems with how limited and unintuitive to use the tools that Larian offered felt to them.
I’ve also read several complaints about how apparently inadequate for the job the “DM mode” was according to most of them.
If it’s a matter of unreasonable expectations rather than actual problems I wouldn’t know.
