I am with auntpiggylpn, I do my very best to get things right, but when I miss the mark a bit, I don't feel I have to rip it out and do it over. However, if I get a block upside down or make some other sort of glaring error, I will fix that.
A point nipped a bit, a seam a little off, I can live with that. But something that spoils the balance or overall look I wanted for the quilt, probably not.
I am all for ummm, design opportunities, though, LOL.