The entire discussion of "this stuff" or "internal mechanics" really involves using that entire fascial being to augment the efforts of the muscles and bones. Most people think of using their muscles to move their bones to execute techniques and this can be enhanced by various exercises to strengthen both muscle and bone.
I think your on to something there.
The only thing that I would like to add is that many anatomist think that there are more nerve receptors in the fascial tissues than there are in the muscle tissues. What I infer from this is that if you focus your attention on the fascial tissues you can gain more feedback on the movements of your body than from the muscle or bony tissues.
Principles about relaxation may have a lot to do with awareness of the fascial tissues.
Just a few thoughts,