I don’t know, I mean, single escape is just one picking approach and relatively speaking it’s an extremely limited one.
I think there are way too many variables to say one way or another. For example you state greater # of permutations as a deciding factor, but that’s independent of degree of difficulty. For example, and this is rhetorical, which is harder: learning to ‘master’ double escape picking movements for all sorts of awkward non guitaristic phrases or learning to ‘master’ fingerstyle/classical approaches for those same phrases? No one can answer that, really because it just depends on too many factors especially those related to the background of the individual. While getting lots of RH fingering combinations ingrained might be challenging, so many people struggle with finding good, efficient picking motions that can handle the music that they want to play.
And to clarify I’m really not predicting anything, again, just thinking out loud about possibilities. Maybe there will be some fingerstyle shredder in the future that develops a teaching method, does lots of lesson and courses and it catches on, who knows. I mean, I don’t think that’s likely, but kind of interesting to think about.
I wonder if it’s something that hasn’t caught on because of the innate difficulty of it, or if there are just approaches that can make it work that not many people have discovered yet. I wonder if there’s ever been anybody who got good tone and proficiency playing bluegrass on a steel string with fingerpicks or nails.
But don’t mind me, just procrastinating here.