Why do you assume that the fish that, for example, jumps the best, makes a better parent? Just another human-decided character.

The purpose of life is to reproduce. In nature, the combination of age at maturity, size, and such are all subject to selection. A bigger fish can dig a deeper redd which is more freshet-proof. The ability to dig a deep redd is useless in a hatchery fish. Maybe they do better with smaller (or larger) eggs than an egg in the gravel. If you've ever played around in a hatchery adult pond you know that the calmer fish gets way less beat up (damaged) prior to spawning. Many think that this "calmness" leads to better egg-fry because of less stress on the adult. Hatchery fish don't need to select mates/impress the ladies. They just need good gametes.

These are all factors that we can't/don't measure.

In order to be successful, the hatchery must produce fish that work well in that environment, just the same as the wild fish must meet those criteria. And they are different.