sharke
All my best playing goes completely unrecorded (and unheard by anyone but me) 
BS. You are not the best judge for your own material, because, just like all of us creative folks, we're our own worst enemy and critics. As Pogo said ... "We's met dah en'my. It's us!"
From a writing perspective, this is important. It takes away the idea that one moment you can and the next you can't. And it helps develop the idea of the whole piece together, and you learn to see it for what it is and how you relate to it.
I have, a lot of small bits and pieces of poetry, like 3 or 4 lines, kinda just standing there, but they never show up anywhere else, until the minute I erase them and send them on their way back to the inventory line for creativity. Almost like clockwork, the next day, those set of words, sometimes just a verb moved, shows up somewhere else ... I end up feeling that we're not machines, and our internal and creative process can not be taken as some kind of mechanical exercise, because that will generally hurt it, not help it.