I do something similar daily, and it works fine, as we have a strong test suite. You can't disassociate dynamically typed languages from (strong) test suites,

I do something similar daily, and it works fine, as we have a strong test suite. You can't disassociate dynamically typed languages from (strong) test suites, so one needs to qualify: > Good luck making changes to a 100kloc Python codebase without test suite versus > Good luck making changes to a 100kloc Python codebase with a good test suite In context, the first case is no different from "Good lucking making changes to a 100kloc Rust spaghetti-coded codebase", and one can't meaningfully judge a something based on a poor use of it.