What are you hiring for? JavaScript doesn't just mean frontend.
I am much more interested in how people pick up new tech and interesting projects than the specifics of the language. With modern libraries and frameworks I don't think you need deep experts in particular languages anymore
Agreed. That was the point of my comment - there is an abundance of developers who just work in JS/TS/React and have not picked up new technologies. Adding C#, Java, SQL, etc. helps your marketability.
I am much more interested in how people pick up new tech and interesting projects than the specifics of the language. With modern libraries and frameworks I don't think you need deep experts in particular languages anymore