BG1 started in Candlekeep. The city itself was only reached in chapter 5 and while it was quite full of quests, in fact the by far most dense area of the game in regards to quests, it was overall only a small part of the game, less prominent than in BG3.
BG2 happened exclusively outside the sword coast.
So I find the "requirement" to make BG the hub of BG4 extremely random and arbritrary. Sure, you can do it this way. But there is absolutely nothing that forces you to do it this way. Or implies it should be done this way.
IIRC the Forgotten Realms setting is four times as large as Earth. There is no shortage of space, or countries. So why limit yourself to BG and the Sword Coast like that ?
I dont think Larian dislikes D&D. Just because they added their own sauce doesnt mean its not a full D&D game. Or simply fun.
For that matter Bioware also didnt exactly treat AD&D like the bible, either. Even if they had no physics games back then, yet.
I doubt anyone will make a BG4 that will make me happy. The fact that BG3 is so enjoyable is already something of a miracle. In many ways its even better than the originals.
But if someone would ask me to do BG4, I would plan a triology of games, just like Bioware originally intented, with 1-2 addons for every game, too.
And I would rather include as many places of Faerűn as possible, not merely focus on the Sword Coast.
