Agreed that it's not necessary to put hands on people. There are better ways to achieve the same thing.
Having said that, that same wrestling coach from HS I mentioned above had this thing we did at the very end of the workout phase of every practice, which lasted at least 90 minutes, that I'll never forget. The workout phase, calisthenics mixed w/some other creative forms of physical torture (e.g. hand over handing our way up steeply angled parallel bars a bunch of times), was unpleasant in the extreme. Many people came out for the team only to quit after a couple practices. Was particularly hard on the football players that came out for the team because the rest of us had a week or two head start and they had to play catch up, fitness-wise. Few football players lasted more than a day. Coach called it the revolving door.
Anyway, this thing he had us do at the end of the workout phase was that we had to hang by our hands from one of those wooden vertical stretching racks on the wall, 4 at a time, for an indeterminate amount of time (probably averaged about a minute). During this time, while we're hanging there exhausted arms vibrating, the coach would walk down the rack and punch each of us, hard, in the abdomen (why, I do not know). At the end of the hanging time, we had to do ten leg lifts touching the rack over our heads with our toes before we could hop down and the next group could go.
Nobody ever knew how long they'd have to hang there exactly and when the coach felt enough time had elapsed, he'd often count off on his fingers as if counting down to zero. But nobody knew if he'd stop at ten fingers or just restart. If you slipped, which nobody ever did more than once, you got ridiculed mercilessly by the coach. He played a lot of mind-fvck games like that.
I look back fondly on those days. But it was a love/hate thing back then.
And all of that "works" except the punch in the stomach part. There is no benefit to the punch. It certainly doesn't strengthen your abs. And it's not a punishment reward if everyone get punched. While you may look back somewhat fondly on it now, while you were in the situation it created a resentment that hindered performance--whether anyone actually knew it or would admit it or not.