Swift isn't a fair comparison at all because it's a mandated language by Apple. For me Scala is just an improvement on Java. It's valuable to people who fetishize complexity, IOW, people who use Java and like it.
Scala is a highly versatile hybrid language that can be used in a way that doesn't promote needless complexity. Just like you need not use the most advanced OOP features, you need not use advanced FP features, nor do you have to use macros. If you don't want to.
This choice is what makes it an interesting and pleasant language to work with. I've often dealt with Scala code that is much simpler to understand than comparable Java code, but still more often than not, Scala code is made needlessly complicated.
That choice implies a certain kind of respect for the programmer: here's a very, very powerful tool, and use it wisely.
Go is the antithesis of this, and I get its point, it's the opposite philosophical direction. I think it's a direction that will not move the industry forward, it's a direction that will undoubtedly help us produce value---software, reliably---instead of doing something amazing.
