Any programmer worth their salt should be able to adapt to a new language when they start at a new project/company. Hiring processes that target people who know language X are just dumb, except for very short-term/time sensitive work.
Seems like a lot of corporate environment has settled on:
"We hire programmers that can use myriad of different languages (except Lisp off course, no one want's to deal with Lisp) and then you also have to know Java because in fallback situation you'd be useless in their time constraint setting //goodbye" that kind of thing, did I get this wrong?
It's true that good developers can learn new things, but it can take years to learn the frameworks and ecosystems. I've seen projects fail due to a lack of skilled developers & having to either recruit contractors, or developers without the relevant background. Being a developer on one of these teams can be a real nightmare.