It matters a lot to me - not that I've done that many recordings.
Seven years ago we decided to record our NYE gig in order to put together a showreel. One of the songs that featured was Play That Funky Music, especially the guitar solo with me playing an impeccable funk riff beneath it all the way through.
Trouble was, I knew damned well that I'd screwed up that riff several times on the night.
Sure enough, the BL (who happens to be a pro video editor) had isolated one of the few occasions I'd got it bang on, and then he'd simply treated that as a sample throughout.
Despite lots of jocularity and band banter ensuing, I was genuinely whizzed off.