Then, as far as I can tell, you "disagree wholeheartedly" with me, too.
Often, particularly when you're talking about the torso and especially so the cervical spine or upper torso (or sternum, etc.), one of those "100s of ways" has to do with what the golfer feels that their head is doing.
I'm also not sure what a "false appearance of improvement" is. I would generally say that I know enough about something to say whether it's actually improved or not.
@Vinsk has been playing longer than that. The length of time you've spent doing something… isn't much of a barometer for how good you are at it. PGA Tour players have been playing golf longer and better than you have… and typically suck at teaching.
Then you were wrong about what "looks" better.
Sometimes that "right feel" is "feel like your head moves forward a foot during this backswing."
Then, bluntly, you're going to be wrong about a lot. Not 99%, but a lot.
And sometimes "teaching them how to make it work correctly" involves telling them "feel that your head does…"
You're not talking with "most instructors." I think "most instructors" are lousy.
We're not big fans of made-up numbers here. And again, I stopped paying for the sins of others on my own site when I created my own site. So stop putting that stuff on me/us.
That's got little to nothing to do with me or the discussion here.
And sometimes getting "the correct body motion" involves telling them "feel that your head does…"
Yeah, I'm not sure either. The only example of such that he's given — that his club is "on plane" but his shoulders are not — feels like a terrible example, and one in which few people here would say "yeah, that's better!"