I try for excellence - I have in a few cases let something that was 1/8 inch or more go by, but for me that's off by a LOT.
I don't think many of us achieve absolute perfection. There comes a point when "good enough is good enough" and/or "this is the very best I can do right now" and that's the way it is.
In five years my skills may be better - or they may not. May as well do the best I can at the moment and leave it at that.
When I look at other people's work, I do try to factor in their skill level and their health.