Being conscious of variable types and function signatures helps you avoid trivial errors and become a more efficient developer. That's just a fact.

You can argue with it or ignore it however you want, but that's simply true.

I also know as a matter of fact that I am more productive than many of my colleagues when working with non statically compiled languages, and that my code is more robust, partly due to the typing I use everywhere. I have colleagues that write JavaScript functions that takes a parameter that could be 4 different types of objects, completely undocumented, and they don't know what's happening one week after shipping the code. I can't stop them doing stupid things like that. They like wasting their life debugging things and refreshing the browser, what can I do.