I think the issue that people are responding to is that you're comparing it to Diablo, which is fundamentally a different game. Diablo is a hack and slash game with rpg elements and a god awful loot system. Bg3 is pretty much just playing DND on a computer without a dungeon master. They're just two completely different games. You can't even hack or slash in bg3, it's turn based and tactical.
That said, if you don't like the aesthetic of fantasy games, then clearly none of this will matter to you.
Frankly, it seems like you mostly care about the aesthetics of a game (no shade, just saying) so I'm kind of curious what your favorite game is?