How common is it these days to hire for languages, anyway? In my case with the devs I hire the only thing I care is that they want to work in a class of langua

How common is it these days to hire for languages, anyway? In my case with the devs I hire the only thing I care is that they want to work in a class of languages, like frontend or backend, and that they're not super picky. I'm hiring people to solve problems for a living. I have full confidence that anyone I hire can learn any language I throw at them. My job (when hiring) is to make sure they'll want to work in the area, maybe a footnote about the language (if even known), but that's all. Why does language matter so much to some people (as far as hiring goes).