I don't aim for perfection..that would be extremely egotistical and impossible, but I do fix a goof......large or small...and thinking back, of all that I have made....caught things before completions!
The most frequent goof is putting a piece of a block the wrong way...although I keep a sample block on a small design easel in front of the machine...to remind me...sometimes, after I sew it and "check", there it is..bold as brass! Frogstitch!