> Node.js isn't particularly excellent at anything

That's not very kind. Yes it has its flaws but it's not bad at being a higher abstraction over async-everything, augmented with a huge module repository. Support for isomorphic javascript can come in handy for some applications.

I've never done Scala but my understanding of it is that it could be a good fit for modelling certain types of business logic while being able to take advantage of exiting java libs out there.

> Knowing more than one tool in the toolbox is a key skill, since there is no one-size-fits-all.

Yes, we agree here. That was the point I was making.