I think this is right, but let me check with you. In order of importance:
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Frequency (Critical). The pick must move back-and-forth at an exact rate, under the control of the metronome. Jitter in each stroke must be kept to a minimum, or the player will be recognized as being off the beat.
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Depth (Important). The pick must hit the string at the right “depth” (does Troy have a term for this?). If the pick is too high, it can miss the string entirely, and if it is too low it can hit another string by accident. Uneven depth will change the feel of the stroke and make uniformity difficult, so I suspect that reasonable uniformity in depth is important. Under a separate thread I suggested that the best way to understand depth is to listen to the unplugged guitar volume in addition to trying to feel the string, I’m not sure if that’s true, but I would bet it is.
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Slop (irrelevant). I think that it doesn’t matter much how the pick ends a stroke. If it goes too far getting trapped, that’s a harmless rest stroke. If it goes too far getting free, it’s just a little higher.
So, frequency is king, and depth is queen. I think that people suggeting that strokes have to be short are mistaken. Right or wrong?