Programming language are not actually that different. There’s only a few models of computation and paradigms. The effort is mostly about learning the syntax, the standard library and whatever abstractions built around the above paradigms and computation models. And learning the standard library is the tough one.

I would expect every engineer to be able to read C#. It’s not that hard.

This. Reading a language (and not only programming languages) is very different from being able to construct good, elegant, routines (or sentences) in that language.