Maybe you're referring to something like the 80-20 rule, "Pareto principle"? More productivity by abstaining from perfectionism?
I just find it much more satisfying to produce small amounts of (what I consider to be) good output rather than large amounts of mediocre output. This isn't appreciated in all contexts, which is why I've called it a luxury.
In some sense, abstaining from perfectionism is the same as producing mediocre output.
I accept the fact that won't ever be mentally at 100% all the time, so I fill my day with many side-projects and can rotate whenever I'm exhausted with one task.
The output quality of each task might not be as high as when I committed myself exclusively to one thing, but overall I learn more and achieve more.
I just find it much more satisfying to produce small amounts of (what I consider to be) good output rather than large amounts of mediocre output. This isn't appreciated in all contexts, which is why I've called it a luxury.