make (the) perfect the enemy of (the) good
To allow the demand, desire, or insistence for perfection to decrease the chances of obtaining a good or favorable result in the end. (Usually used in the negative as an imperative.) I know you want your research paper to be great, but don't make perfect the enemy of good, or you won't even finish it in time! As a manager, you have to realize both the potential and the limits of your employees. Push them when necessary, but be sure not to make the perfect the enemy of the good.
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