Technique goes far beyond gymnastics. Technique is also the way an artist interprets a given piece of music, their sense of stylistic awareness, their large-scale concept of the music, and their sense of working within the limitations of a given medium (instrument) to impress on the listener that something much more spectacular has occurred. These qualities apply in spades to all the artists I mentioned above. I am not so sure that "greatness" is completely intangible.
That said, manual dexterity is one very, very important factor in determining whether an artist can ever achieve this kind of transcendence. The more dexterous the musician, the more complex the musical ideas may be, and also the more depth may be implored into more seemingly simple or otherwise common musical statements.
I guess I just don't like to be constantly reminded that I am listening to a guitar every time I listen to a guitar!
That said, manual dexterity is one very, very important factor in determining whether an artist can ever achieve this kind of transcendence. The more dexterous the musician, the more complex the musical ideas may be, and also the more depth may be implored into more seemingly simple or otherwise common musical statements.
I guess I just don't like to be constantly reminded that I am listening to a guitar every time I listen to a guitar!