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Nice comparison. I believe every language has a purpose.

Ruby is a good choice for front end. We use them to build front-ends (https://github.com/megamsys/nilavu).

Go is a good choice for system programming, its native binary interests everybody.

Nodejs is good choice for realtime programming.

Scala is concise and good when you need heavy duty API and such and allows to build a robust code (https://github.com/megamsys/megam_gateway)

> Nodejs is good choice for realtime programming.

...for some definition of realtime. Javascript and node.js are terrible choices for serious signal processing systems, for example.

We really need to find another word for the kinds of browser applications people call realtime these days.

I propose: Humantime. Humantime means that you react as fast as person would give a crap about.