So people don't look at the code, or the tests.

So they don't know if it has the right behavior to begin with, or even if the tests are testing the right behavior.

This is what people are talking about. This is why nobody responsible wants to uberscale a serious app this way. It's ridiculous to see so much hype in this thread, people claiming they've built entire businesses without looking at any code. Keep your business away from me, then.