"Perfect is the enemy of good"
Robert Watson Watt wrote in 1999: "Give them the third best to go on with; the second best comes too late, the best never comes."
Voltaire wrote in 1770: "A wise Italian says that the best is the enemy of the good."
Montesquieu wrote in 1726: "The better is the mortal enemy of the good."
Shakespeare wrote in 1606: "Were it not sinful then, striving to mend, to mar the subject that before was well?" (don't fix what ain't broke)
Chinese proverb says: "Better a diamond with a flaw than a pebble without one."