Well, the musical analogy here doesn't work too well, unfortunately. It's not a matter of a classical musician (aka 'internalist'

playing with more precision and than the rocker (aka 'externalist'

does. External stylists practice their 'scales' just as much as internalists do; in fact, anyone involved in a fairly traditional style will tell you the basics are hammered in over and over again. Speed is irrelevant here; there's a learning curve that must be followed to learn any technique, and techniques are practiced slowly as well as quickly in many styles, all to get that 'precision'.
??? Every movement somebody makes involves physics, whether they're internal, external, or extraterrestial

. I think you're trying to say that supposedly internal arts require more 'control' or 'precision', which kind of misses the point. You're not trying to make your movement more 'precise' (whatever that means) in internal arts; you're instead trying to learn how to relax completely and thereby assign more power (which has to be trained) to the legs and waist area and minimally to the shoulders and arms. Hence a qualitatively different way of generating power. You can hit hard either internally *or* externally, but they're not the same. Hence, to use your musical analogy, it's not just a matter of playing 'scales' better than the next guy.
Wrong again. *Every* art, whether external or internal, uses the mind to control the body in some fashion. So as a general statement, it's too generic to be of help. In internal arts, the mind does what I feel are a few unique things to make the adjustments toward applied force, but this is something different than the maxims you're postulating.
Well, externalists don't typically run down so-called 'internal arts' because they themselves have no staying power, but rather because they see a lot of nonsense going on with most people styling themselves as 'internalists'. And rightly so. You have to have a high-level person show you some things to begin to get it right, and as Mike Sigman often tells you here, there are that many non-asians who can teach you the right foundations. Heck, not that many asians can either

. Go for the top guys. It's always the best advice somebody can give. If you do, you won't talk like this in your next post

.
Regards, Jim S.