It's been good to see the growth in the Scala community on many fronts. The Scala subreddit is starting to get quite lively. I've also encountering more developers using Scala at work rather than just something they use for side projects.
The article does raise a good point about immutability and functional programming. It's something that shouldn't be assumed, especially for Java developers making the transition (there seem to be plenty of Java developers switching to Scala lately). Scala combines functional and OO programming, and there are use cases where OO style coding makes more sense. Martin Odersky even mentioned that in a presentation a while back. Immutability and asyc are very powerful, but not everyone uses these approaches. Selling folks on Scala is one thing, getting them to make a jump to an (awesome) library like Akka is a bit too big a jump to make in one step.
The article does raise a good point about immutability and functional programming. It's something that shouldn't be assumed, especially for Java developers making the transition (there seem to be plenty of Java developers switching to Scala lately). Scala combines functional and OO programming, and there are use cases where OO style coding makes more sense. Martin Odersky even mentioned that in a presentation a while back. Immutability and asyc are very powerful, but not everyone uses these approaches. Selling folks on Scala is one thing, getting them to make a jump to an (awesome) library like Akka is a bit too big a jump to make in one step.