Jobs and market have a huge factor of 1. politics 2. synergy

Almost the only reason that python is popular and people do everything with it is synergy. The only reason that javascript is eating the world and any web dev has to know it, and people do everything with it is synergy.

A big reason for C# to have popularity is because it's for Microsoft (politics).

These are just some examples. Being used doesn't mean anything.

There were and still are a ton of PHP jobs. You tell me, is it because PHP is a great language and solves our problems? No, because it has synergy.

If you're good enough, you can pretty much choose what language/framework you work in.