Yes, I did cite him! However, my conclusion about him was (and this might be nonsense, I’m not sure) that an expert can take whatever approach he or she wants to ingest a new piece; he has already demonstrated repeated excellence on other pieces. I suspect that he became expert by their usual steps, where I presume his teachers were making him practice as usual.
I bet (no evidence!) that if we watched him play in slow motion and at full speed, we’d see the same motions. I think @tommo is right that this doesn’t happen for most guitarists; indeed, I recall Troy once observing that when many artists show something at “low speed” they make totally different motions than when they play it at high speed. It would seem to me—this is merely intuition, with no fact to support it—that low speed practice in guitar should be exactly about which note gets swiped, or whatever, so it’s a done deal before one tries to go faster for that particular piece. In other words, there should be one way to play something, and it’s just a question of choosing a tempo. (Again, zero proof, merely intuition.)
EDIT: I asked ChatGPT 4, and at first I interpreted it as suggesting that I’m wrong, but now I don’t know what to think!
I trashed most of what it said to save space, but this surprised me the most (if it’s true):
Faster tempos may require adjustments in fingerings and shift points to facilitate better agility and technical accuracy. These alterations would be more tactical in nature, designed to enable smoother playability at higher speeds.
The overall summary:
In summary, while the core structure of a musical piece remains constant, the nuances of bowing, phrasing, dynamics, and other interpretive elements are highly sensitive to tempo changes. Expert violinists use their mastery of technique and deep understanding of musical expression to adapt their performance to different metronome speeds, creating a unique rendition of the piece each time.