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.
2x Wilson BLX Pro Staff 95 2012 - 13.0oz - 9 pts hl and 10 pts hl - Xcel 17g @ 55lbs