I have a couple of guitars (big-name manufactured) that now have dings and dents in them, not because of gigs but my children knocking into them or accidentally knocking them off the stand, etc.
I had two choices:
[list type=decimal]
[*]get angry, throw a tantrum, scream, yell, swear, and scare the hell out of them
[*]recognize that they felt terrible about it the moment they did it, it wasn't deliberate, and I can gently and calmly use those as moments to remind them to be mindful of their surroundings
[/list]
I chose #2. Those dents do still bother me, but in the big picture, they don't affect playability or sound. It's just that "perfection" aesthetic. And it's not worth terrorizing my children for it.
And thank you for the info about the Navaho "spirit line." In Japanese craft, the use of intentional flaws is called "wabi-sabi," as a reminder to acknowledge and accept imperfections in life, and that nothing is permanent.
(I had to look that up just now, because while reading more about the Navaho, I was reminded that the Japanese also do something similar)
These are good guides for our own musical craft.