I disagree re BG3 not being that easy to follow in terms of the rules - I think you can learn any game you want these days even if you are new to the genre. There’s so much info online from wiki to streamers to fan made guides etc.
I don't argue BG3 will be impossible to figure out (5e is approachable to begin with) but refering to online guides is very much what I would see as an issue. Even on D:OS1 Sven said that playerbase didn't understand resistances - therefore binary and awful armor system was born. I assume that aim of making the game approachable is the reason why Larian cheese is so prevelant - so players can use simple, easy to figure out solutions to their problems, instead of heaving to understand underlying systems.
That oddly is enough somewhat faithful to BG1&2, where the game was easy enough so one could power through most of the game without understanding basic stuff like how armour or attack works (I had a friend who progressed a decent way through BG2 without armour and resting and he thought armors make you more likely to be hit and that you can rest in the inns only. He still had a good time).
Still there is also a little problem of BG3 not being a faithful adaptation, so finding info on how BG3 works can be frustrating. BG1&2 had manuals - I doubt BG3 will have something of that sort, or if it would be a good solution for a modern audience.