To be honest I am really not bothered if the party is six or four
As I said, I thought I was over the issue as well.
But then the more I played that other game, the more I realized how much this would be lacking in comparison (well, I mean on this particular aspect).
And the thing is: it doesn't have to. Even Larian people said it isn't exactly set in stone yet, which is why I'm making a last attempt to have a dialogue (mot likely indirect) with them.
At very least they should try to be a bit more convincing about how this is "for the better", especially considered how since the reveal they really haven't been throwing to the "old Baldur's gate purists" a single bone to clutch on.
Maybe a six slots party and a point&click system that doesn't blow is something that can still be achieved.