When success is not defined and perfection is the default, anxiety rises and performance falls.
Pursuit of perfection rarely feels good. Perfection is very expensive, and most people are unwilling to pay for something to be perfect. Also, it is subjective… By defining success at the onset, with constraints of time/money/etc, we make it objective – much less emotion and much more performance.
It does not mean to seek out mediocrity. It means seek out success.