Let me get a picture to show the disbelievers. Thank you GJ by the way.
Observe:
his fret tapping hand is arced the same way you would hold a pic with 3 fingers. that "arc" hinders you in speed and could lead to damaged tissue. The constant over stretching required to play that way, an overstretching that your mind has accepted as normal and that you subconsiously except as "part of playing" so you dont feel the stress. Can you play fast and accurately without any fatigue, picking every note, say 16ths at 180 bpm with that hand position? For about 14 minutes? I doubt it (and yes it is possible, just go see some of the solo work that John Petrucci does thats insanely fast and long).
This picture showcases the arc much better.
This next one doesnt show much arc, mainly because I didnt hold the pick correctly for the photo. I didnt adjust my hand as if I had the guitar in my hand, though if I would have you would see a much more noticable arc. NOTE: I had ny hand in the right position, but from months of training not to hold the pick like that, I experienced pain and tension and without my noticing I adjust more towards the traditional technique, yet not quite correctly.