(even though it’s abundantly clear that BG3 is by and large the favorite larian project by the fanbase, so absolutely nobody would complain as a consumer if they kept updating this game instead of working on something else)
That is categorically not true.
People will complain about EVERYTHING. No matter what you do, SOMEONE will complain.
Personally, I would be annoyed if Larian kept on updating BG3 instead of making a new game... Mostly because I much prefer DOS2 over BG3 (With the exception being combat - DOS2's armour system was horrendous and the AP point system was annoyingly restrictive). But also because I hate the use of DnD while diverging so much from the actual DnD ruleset (If I'm playing a DnD game, I want to play a DnD game...)
To me, it'd feel terrible for them to waste time trying to put lipstick on the pig that is BG3, where they're constantly fighting against the DnD ruleset and setting (And fixing the story would require massive rewrites...), when they instead could be working on something that jives with their style and desires (Be it Divinity or a new IP I'm not too concerned, so long as it's something they have full control over).
