Well, yeah, if you have 100% test coverage it doesn't matter. The thing is, with a dynamic typed language you have to have 100% test coverage to have any idea

Well, yeah, if you have 100% test coverage it doesn't matter. The thing is, with a dynamic typed language you have to have 100% test coverage to have any idea of whether the thing will even run. One misspelled variable will take down your server (something that frequently happened to me in development). With a static typed language all you need to worry about is logic errors. Yeah, you should have tests (and with a server, there's really no reason not to), but the reality is that tests are a pain to maintain, and writing the test often takes as long as writing the code. So, along with documentation, the chances of 100% test coverage is minimal unless you are in control of the project. With a statically typed language, at least you know somebody didn't make a misspelling in an infrequent code path and doom your server from the start.