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Languages aren't hard to learn once you've got 1-2 under your belt. FWIW I wouldn't consider myself to have "absolute mastery" in any language, there are some

• heipei 5y ago
  They might not be hard to learn, but it's still a considerable mental overhead to switch between writing JS on the frontend and anything but JS on the backend. I frequently mix up the simplest things, like len(list) vs list.length, or how that you can't use obj.property on Python dicts, or list.append() vs array.push(), etc. And then you might have a great tooling library in one ecosystem (like lodash in JS) and try to replicate the things in your backend language. That sort of context-switching simply isn't worth it in my opinion.
• tored 5y ago
  Languages are not that time consuming to learn, it is the development environment, frameworks, libraries, community, best practices, tooling etc that takes a lot of time.