Bullocks. I wrote thousands if not hundred thousandths lines of untyped Python code in over 15 years, for critical systems and thousands of users. It works for me. I'm not confused about the code, I can code and debug quicker than many of my typed-language colleagues and even now that python supports type hints I often only use them in bigger projects or in places where they're actually convenient. It's simply the way of working that a developer is used to.