[duked]

Did you ever worked ? In all companies I worked for (I'm a researcher) I had to use different languages: java, c, c#, asm 86, perl, python, ruby ...

Honestly it's almost a requirement to be able to adapt to other languages or at least read and understand what it does.

[psylence519]

Indeed, I did ever worked. Of course you need some breadth of knowledge, but unless the place was absolutely tiny, your low-level developers writing VHDL weren't going to be asked to optimize a SQL query or tweak CSS.

Not that they couldn't, but why would you?