"Why does anyone use the wayward queen attack?"
(proceeds to play from among the very few responses that will effectively repel said attack)
Gee I don't know, maybe because it succeeds often enough to be worth it?
you are missing one crucial detail. there are indeed very few responses to repel the attack, but the responses that don't, are including things like this:
and this
where black is making huge and obvious blunders. Really the,"few" responses that repel the attack are played 99.999999% of the time if you are a complete beginner, and 100% of the time if black is above 200 ELO. Black can just carry out a counterattack and gain a solid advantage. one mistake on your part and decent play on theirs sends you cascading into a complete catastrophe of a position with black completely dominating.
"Why does anyone use the wayward queen attack?"
(proceeds to play from among the very few responses that will effectively repel said attack)
Gee I don't know, maybe because it succeeds often enough to be worth it?
And fails later. Then what?