An unchallenged belief in one's own perfectionism is a smuggled infinity.

The intuition of a smuggled infinity: "If you slip an infinity into any argument you'll end up in an absurd place"

It's easy to accidentally slip in an infinity without realizing it.

Perfectionism: Not only perfect execution on a plan but also no surprises that invalidate the plan.

The former is unrealistic.

The latter is impossible.

Previous track records of perfect results become increasingly impossible to hit over time; the likelihood of at least one slip-up grows geometrically.