Naturally they could slightly improve the tooltips within the game to make things more clear, but it honestly all depends on the player and their level of interest. Some will have no issues getting into it, others might need some guidance, while some will require a dusty old 3000 long page tome explaining every single thing down to the letter. And some will simply be hopeless in getting into it no matter how much the game holds their hand.
I personally never played a turn-based RPG prior to BG3 and had absolutely no issue getting into it nor understanding it. Nor DOS2 for that matter, because these games held my interest and I wanted to get to know them, so was able to figure out everything inside of the game just by playing or by reading a tooltip when something was of interest to me. But that's just me.
I see Larian RPGs as accessible games where one does not need prior experience in order to get into them or even enjoy them. And there are definitely some RPGs out there that require you to read a bible of rules in order to even try to get into them
