I’d like to write up a proper response, but I’m not sure it’s honestly worth the effort. I’ve written a lot here on similar subjects before. @Rufian seems to be totally convinced that he’s correct, and I don’t get the impression that he’ll be particularly receptive to what I would have to say.
However, I will say this for other readers.
Based on my experience, I have come to believe more and more that when we encounter an expert whose capability and performance seems incomprehensible to us, it is extremely rare that they are doing what we are doing and simply “doing it better.” Most often, they are doing something different to what we have been doing, which is naturally more amenable to achieving their seemingly incredible results. They may not be consciously aware of this, they may even believe that what they do is no different to what is commonly done or taught.
I actually make a similar analogy to MIDI clock in lessons regularly. You connect your picking and fretting movements to your internal clock. You learn to synchronise your internal clock to something external (metronome, drummer, etc). You build a vocabularly of rhythmic coordinations of both hands (or “rudiments”). You trust your sense of time, set yourself a higher internal rate and go. You succeed or you fail. Your failures are the feedback that helps you to learn.
That’s the process. There is a lot more to be said about the details of how it’s done, but that’s the big picture.
I haven’t been teaching all that long, but I’ve seen both situations quite frequently.
Technique is informed by constraints. Performer constraints, environmental constraints and task constraints. I would say that the task constraints for the fretting hand are generally more complex than those for the picking hand, and I don’t think that’s controversial. I also believe that performer and environmental constraints are more significantly variable for the fretting hand that for the picking hand, though that might be more debatable.
This might turn into a rant. I think it’s fair to say that the “conventional wisdom” for fretting hand technique is either overly naive (lies to children, maybe) or just plain wrong. Once we filter out rubbish like “finger independence” and the typical conception of “economy of motion,” what is actually left?
At most, you’ll be told that it’s important to relax and minimise tension, but there’s no practical method given to actually achieve that goal. Moreover, the teacher will probably demonstrate some “canonically correct” form which doesn’t even facilitate that. Then it’s “try this exercise.” Just what guitar pedagogy needs. More “exercises” which don’t transfer into actual playing.
I’m sure some of you will have seen a recent YouTube short where a teacher criticised the fretting hand technique of another YouTuber. I won’t name names, but if I said it really PISSED ME OFF (but I’m not even mad), you might get the reference. The teacher puts out some good content (and I’m definitely not in his intended audience), but this video was the usual story about economy of motion with a demonstration of a “correct” form. More of the established dogma (this time weaponised). I’m wearied by it.
This is not what great players are actually doing. It’s just not it.