Tim Berry notes that necessity is not always the mother of invention:
Do you see what I mean? At first it’s slick and powerful, doing something way faster than the old way of doing it. And that’s productivity at its best. But soon the advances are taken for granted. The bar of expectations goes up, and you spend the same amount of time.
Which is why the saying is reversed. In these cases, it’s not like it’s supposed to be, necessity as the mother of invention. Invention becomes the mother of necessity.