When aiming for perfectionism, the metric used may be usefulness towards… something.

Each metric represents a layer covering perfectionism.

However, this metric is one that can be used outside perfectionism. Meaning it is useful in and of itself.

To release it from perfectionism, a recursive loop may be created.

Your effort is useful for the result to become useful.

This never ends; however the next step is no longer perfection. It is merely a different usefulness.