At Google, Search Quality was a center of excellence.

We knew it was where the core of the value in the company came from.

That team was known to be high performing, and use operationally mature, industry-leading approaches to the problem.

In general the core of your differentiated value--the enabler of your differential value--should be a center of excellence.

Your center of excellence should be a point of pride inside and outside the company.

Most of your effort should go into becoming even better at the driver of your differentiated value.

For everything else, the bar to clear is not approaching perfection, but "good enough".