perfect is the enemy of good

Etymology
Variant of the older the best is the enemy of the good, popularized by in French as, itself a translation of the  proverb.

Proverb

 * 1) Insistence on perfection often precludes the opportunity for something worthwhile.
 * 2) Insistence on perfection precludes gradual improvement through compromises.

Translations

 * German: das Bessere ist der Feind des Guten