(I don’t think this is off-topic, so adding to the thread)
Yes, I believe it is, but you’ll have to try it out for yourself and see how it goes.
First, you have to get the “idea of the motion” correct, if that makes sense. You can only get this through fast playing like CtC recommends, because fast playing is completely different than slow playing.
Once you have the idea, though, I think that trying different volumes is a great idea. Picking is a complex process involving tensing (excitation) and relaxing (inhibition) of muscles at precise times. (You can’t get that consciously, it’s too complicated, so you have to delegate that to the unconscious/reflexes.) When you first start playing, most people can get the “excitation” part quickly, because it’s easy and obvious, but the instantaneous relaxation is harder. By playing quietly, you’re actually regulating the amount of “excitation impulse” in your nerves, getting things more under control, and staying closer to a relaxed state. The regulation is the important thing.
Andy Wood talks about this a bit … he recommends playing with volume control. Play it loud, then back it off to quiet (pianissimo). They’re the same muscles, essentially, but different impulse strengths.
A great quote from Kochevitsky (https://www.amazon.ca/Art-Piano-Playing-Scientific-Approach-ebook/dp/B017O7R4SC):
Regulating the timing of successive movements of the pianist’s playing apparatus is one of the main problems in piano technique. Another is the regulation of tone volume. This ability must also be developed, and again the process of inhibition plays the main role in this regulation. We are familiar with the common occurrence of a student’s playing in recital much louder than he intended. Because of weakening of the inhibitory process as a consequence of nervous excitement, he loses his ability to regulate dynamics in his playing.
For strengthening the inhibitory process, I recommend practicing pianissimo, extremely evenly, in slow as well as in faster tempos. The student should also be able to regulate both sudden and gradual increase or decrease in volume in any section of the composition and in any conceivable tempo, The ability to do this, plus the ability to slow down and to stop at any given moment, is the best proof of proper balance between excitatory and inhibitory processes.
I feel those translate very well to guitar, once you have the basic ideas for a motion down.