They say perfection is enemy of the good. But in a context of "art", it does not apply. Without striving to achieve such perfection, an art is not an art.
Sure, it wont be achievable to microsecond level but I prop the artists who strive to be perfect (as well as who don't)
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I sometimes go to concerts and sometimes wishes they sing/play like they recorded. Some really suck live, with some diff gig as they cannot pull studio quality performance.
I want to see what I paid for. They can change their plays but still want some solid work.
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e.g. I watched Burton C. Bell (Fear Factory) before he parted his ways. He was good initially but in some live sessions, he was really bad, could not keep his pace, with cracking voices. (he had his reasons for not doing so professionally for his family and legal battles)
But I want to see and listen what I paid for.