Ah, the same old refrain [1]

[1] https://github.com/louthy/language-ext/wiki/%22Why-don't-you...

You aren't wrong, but a lot of people are only comfortable in one language/style of language (so either just say Java/C#/c++ or maybe all Algol derived languages). Growing beyond that can be scary until you've done it a couple times if you wait until later in your career to start trying things like say Lisp or Haskell.