I like the idea of imagining that we can arbitrarily adjust the carefulness knob, but I don't think it works like that in reality. You can certainly spend more

I like the idea of imagining that we can arbitrarily adjust the carefulness knob, but I don't think it works like that in reality. You can certainly spend more time writing tests, but a lot of the unforeseen problems I've hit over the years weren't caused by lack of testing--they were caused by unknown things that we couldn't have known regardless of how careful we were. It doesn't make for a very satisfying post mortem.