Did multiplayer detract from Baldurs Gate 2or Icewind dale? Cause they had that.
Baldur's Gate2 was a singleplayer game, with multiplayer slapped on top of it.
D:OS1&2, and it seems BG3 are multiplayer games, with singleplayer slapped on top of it.
That's just how it is, that's what Larian does.