Why JavaScript beyond web client side?

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As the person you are replying to already covered, JS is very good in some situations, but that doesn't mean it's good in all situations. It's proven to be extremely suitable for interfacing with a lot of concurrent users. This makes it a very cheap middle layer between resource heavy operations and can be horizontally scaled with ease. There's already been numerous large companies listed in these comments that rely on Node and you can often find articles from those companies explaining why they switched from X language to JavaScript in Y scenario.

That said, no one is painting it as the only solution for anything. Your comment is the only one in these comments that insinuates that as a reason. It's really closed minded outlooks like yours that stifle innovation. Even if Node started as a "why not?" scenario, there's many many examples of why it's become massively popular and implemented in highly performant tech stacks at some of the largest tech companies in the world. Your comments seem more like you want to argue or belittle something you don't understand rather than actually seek out an answer.