Agreed, love Scala, and I think it can lead to super maintainable code bases, but you do have to be careful. The worst offence is probably when people start to get comfortable with implicits, and start throwing them everywhere, definitely need a good code review process to stop that.

Also, the article left out probably my two favourite parts about Scala - awesome language level support for concurrency, and pattern matching. Whenever I go to languages without these features, I really miss them.