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.