[6stringmerc]

I love how often this comment gets upvoted because it's the perfect opportunity to point out usually 1% or so of any given cohort will have inherent talent that can be recognized as "Above Average" or maybe even "Exceptional." Throw a bunch of practice in, and yup, this is inherently a reasonable consideration.

Point being, most people don't have what it takes to cut it, so might as well aim for a really high investment of time and effort, and eventually plenty of walls will arise. For me, it took somewhere in the neighborhood of "5 Walls" before I could become cross-genre competent, and I've still got Wall #6 I'm kind of reluctantly ignoring (sweep picking, FWIW).

Most people give up around Wall #3, playing through extremely painful finger tips to the point of growing useful callouses (the kind you can stick a safety pin through and not draw blood).

A lot of this discussion tends to have trouble differentiating between "Imaginative Genius" and "Craft Expertise" and basically what we call "Success" is a labor of love, passion, or lunacy somewhere in the middle.