I think that was the idea of Scala — to provide all of the modern language features in one language so that you don't have to decide between, say, Java libraries or higher-kinded types or actors. You get them all, you can mix and match. This is powerful because it gives a good basis to test any new feature on a substrate that already has all the existing ones.

I think this lack of an arbitrary feature boundary makes it a useful research language. However, for the same reason, I imagine it's not so good in production — it's like Perl with "more than one way to do it," but now you need a PhD [1] to understand several of the myriad ways of doing things.

[1] You don't need a PhD, but I'm guessing only a very small proportion of working programmers know what, e.g. a higher-kinded type is.