Isn't the only way to learn what things we can ignore and what things we can't ignore to do a lot more testing? Is there a better way to learn that? It seems li

Isn't the only way to learn what things we can ignore and what things we can't ignore to do a lot more testing? Is there a better way to learn that? It seems like having a lot more data from tests is the kind of thing that would have some short term harm but massive long term benefits.