What about Aerie and Viconia? They are quite good, except that you might have wanted something more directly related to the sun or the moon. Or male elves. And then compare them to some gnomes or dwarves, of which there is only one in the game.
As for the uniqueness of companions in BG3, I think it's because you can play as them as the main character, which adds extra interest for the player (although it's not necessarily something everyone needs). But even in Mask of the Betrayer (NWN2), I didn't really like this trend.
But I've already felt the lack of moderation, and that's true. Although, maybe it's normal for Larian games...