Swordmasters in the renaissance studied each others' books and teachings, much as physics students might study the publications of others in their discipline. The insights they each made might not have all been in technique itself, but sometimes in new ways of teaching it, or describing the nuances of what their masters ("no, do it THIS way ...") had told them in a different way which made it easier to teach.
For many physical endeavors, it seems like there are often a few Good ways to do something Right -- shoot a bow, hold a calligraphy pen, etc. You MIGHT stumble upon the best way to do it on your own, but it seems a little ridiculous to scoff that someone is "not creative enough" to figure out what nuance of technique they have been missing.
That's correct!
Like Isaac Newton said - if I have seen further, it is by standing on ye shoulders of giants.
Link: http://digitallibrary.hsp.org/index.php/Detail/Object/Show/o...
But the point is that it was one specific (and subtle) technique that I missed, and everyone else missed, or didn't instruct people to do - that completely stalled my playing. And I know I'm not the only one!
I have met two fine young bassists who were both crippled by trying unorthodox techniques, to the point where it interfered with their careers: For instance they had to curtail preparation for critical auditions.
Meanwhile, I have consciously stuck with the stodgy classical technique that I learned as a kid, and at age 52, can still play a four hour gig on the one instrument in the band that never gets a break.
(say, extended guitar playing techniques)
An open question so far.