That's the reason for every commercial maneuver.

When do 8s on pylons come in handy outside training? When do you do lazy 8s outside training? For that matter, why do we do any maneuvers short of slow flight and stalls? Just like doing drills when practicing for various sports, we do them to increase our fundamental skills.

I prefer working with commercial students more than primary or instrument. I actually get to fly the plane a little when demostrating the stuff for the first time and they actually take a little skill to do nicely. They're always a challenge.