I like scala and I think it's a great language even with teams.

I think you're overlooking the context of the language. It was a language that introduced a lot of new concepts to most programmers out there on top of that it was flexible to accomidate existing Java developers (for better or for worse). It evolved and grew quite a bit.

The fact that you could develop different styles made the language a lot more useful.

I'm not sure what you mean by transferable skills.. but that sounds like code for overly excessive coding preferences by hiring groups. If you're working with Play you'll be able to learn Finagale, or go to Http4s.

When you attack a codebase, you can't consume it and understand the full context easily, the range of operations that a code base is expected to do is far too vast for that. Even with Go, you can't just pickup and go that quickly. It may (if you're that experienced) become easier to understand. But with a large codebase, it's going to make it much harder as that it encourages large drawn out functions and verbose handling of errors. Also, Go's testing preferences tend to make it harder to write good and effective tests.