I'm not adding the qualifier. I'm going from what he wrote about kids being able to do things properly without input from adults, and adults basically messing things up.Properly? No. Not even really with help. But improperly, we were hitting balls with bats, tennis rackets and you name it, at 7 or 8 without any coaching. We were playing football in the park, and doing all sorts of things, just by having seen it on tv. I think you're making more of this than exists.
You're adding the qualifier of "competently" to this. Competence, at age 6, is a ridiculous standard, coaching or not.
Once again, I see the original point, and sure. I get it. Some qualified coaching would be great. But without coaching, we aren't going to see kids wirithing on the ground, clutching their poor elbows, moaning and unable to use their arms. This is, at worst, harmless goofing around.
At that age, I was probably swinging baseball bats and tennis rackets. My dad gave me some coaching on both, so I'd be able to do them at least somewhat correctly. That's about all that's needed when a kid is just playing around with them like that. If they're going to do something for 30-60 minutes straight, and the point is to introduce them to an activity, they should be given some marginally competent input. That is for both safety reasons (if there's any safety concern, and I think there is some reason behind that concern with repetitive punching for that long) and so they are actually being introduced to the activity, and not something vaguely related to it (see my earlier post about gymnastics).