system
A chat on subreddit /r/NoStupidQuestions
human
While the majority of people are never going to pick those options, theoretically someone might have some sort of interesting tactic that could require manipulating your opponent's moves that would work better with a less powerful piece.

Mainly, there's no reason to remove the option even if no one is ever going to use it.
gpt
There could also be a bizarre board position where the queen would trigger an undesired stalemate.  Maybe you don't want something that can attack diagonally popping up right there... and I totally missed the other comment to this effect.  Nm!