It's not the bad practice that's good per se, it's how you deal with it mentally. How you do the drill without having your best stuff is important because no player is always on his best day. You have to have different options to win consistently and that is developed through practice. Reflection can come after the practice. I don't think abandoning a practice helps.
Yonex EZone Ai 100 - Yonex Poly Tour HS 125 16L Green @ 50lbs