Sorry, Master, I think I have to disagree. String switching with a bow would be easiest, if the radius was infinite = the strings totally flat. Of course, that wouldn’t work, because you would bow all strings at once, but the switching is easier, the greater the radius is. Of course it requires more precision then.
As for guitar, I thought about this some more:
1.sweeping
I think we all agree, that sweeping is (theoretically) harder on a radiused guitar.
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1 NPS arpeggios
Even that should be harder, because (example, pick D-g-b-strings):
a. Pick D-String with a downstroke, UWPS to clear g-string → No difference.
b. Pick g-string with an upstroke, now the g-string gets in the way of your picking path towards the b-string. As the b-string lies “deeper” due to the radius, the g-string sticks out higher as it would with a “flat” guitar, so the escape-motion has to escape even more. The next string is buried deeper behind the string you have to get over.
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1WPS
The Pickslant has to be adjusted from low to high strings, otherwise you hit the string on the “escaped” side.
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2WPS (scale playing with odd NPS)
It really doesn’t matter, as the only thing that counts is the angle or relation between the picking motion and the plane defined by the two adjacent strings your playing.
Yes, you can pick with a straight line without hitting the adjacent strings, but If that’s a problem, we don’t have to discuss string changes.
See it that way: There might be idea that it is easier to get over the string, but then it is a longer way to get “under” the string to pick on the next picking motion.
So far my theory. Try to prove me wrong, that’s how science works
Tom
P.S.: None of this matters in real world playing. It’s just brain-iron-pumping.