For me, BG3 needed 5E. It's a faithful crpg modelling the table top experience, using the best iteration of the rules to date. Focusing part of the game around camp drama was stroke of genius move.
Personally, I'm not very interested in learning other complicated rule-sets. I played DOS1 and recall thinking it suffered numbers bloat, that's like a system problem from 4E days. New rulesets need to hit the ground running. A good example is Darkest Dungeon 1, I grokked that quickly, simple to play but complex to master.
Also, Forgotten Realms is valuable IP. By now it's about as rich in lore as Tolkien's Middle Earth, due to all the content creators. And having Ed Greenwood as custodian is very smart.
