Voltaire said, "The best is the enemy of the good."

John Miles rephrased it for the Direct3D/OpenGL battles back in 1996 or so, and I like his version even better:

The good-enough is the enemy of the excellent.

I'm an idealist at heart and a perfectionist in practice, and I die a little inside every time something that's good-enough destroys something that's excellent.

Here is a related rant.