Okay, for that exercise would never look at the mirror. Hell, dig through the old photo's of Franco Columbo and others you don't see them craning their necks to look in the mirror doing bent over rows. To busy lifting.
So what's your point?
A. Franco Columbu doesn't need a mirror because he's a noob and doesn't know what he's doing anyway.
B. Franco Columbu doesn't need a mirror because he has spent decades in Olympic weightlifting, powerlifting and bodybuilding.
I admit that mirrors aren't helpful for a lot of exercises, especially any that need you to change your stance so you can observe your position and technique. If you are truly looking to practice Zen-like body awareness, by extension you should be lifting with your eyes closed or a blindfold on. Can imagine how badass and self-aware your running would become if you mastered doing windsprints on a treadmill in a blindfold?