A good product, like a good explanation, is “hard to vary” and has reach beyond its original intent.
Changing any part of the product makes it worse.
It’s built to the edge of its constraints.
Users use it to solve problems that it wasn’t intended to solve.
There are no returns to doing “average” work (outside of make-work jobs and physical labor).
All the returns come from doing *great* work, and scaling it up.