I know plenty of productive programmers who aren't even computer science majors, and just work in Javascript and Python. And I also know people who code in Rus

I know plenty of productive programmers who aren't even computer science majors, and just work in Javascript and Python. And I also know people who code in Rust and Haskell, and can never meet a deadline. Theoretical chops doesn't make a good programmer. Knowing that immutability is a good thing and abandoning the imperative style, or even being comfortable with a functional style, isn't a prerequisite to being productive in most organizations.