[lbill]

You are right! I work on test automation for end-to-end testing. I dare say my work is very useful and has prevented a lot of bugs from hitting our prod. But at my workplace we also all agree on the fact that it is often quite painful to locate the cause of the bugs that I report, precisely because we don't have enough unit tests on our old code.

Since we live in a world of limited budget and time to spend, I agree with the conclusion of the article: "use unit tests where it makes sense". It is what we try to implement on our new code (and when refactoring legacy code).