Sometimes everyone acknowledges and wishes that solving X were the path forward, but for political, inertial, technical-debt, financial, or stubborn customer-related reasons, we must think only about Y.
These conversations often end with the responder saying "then you should change teams." Which might be the ultimate XY answer.
Frylock: Have you seen my towel?
Master Shake: Just use a paper towel.
Frylock: I'm taking a bath.
Master Shake: They're right in the kitchen, just go get 'em!