I think you're missing perhaps the biggest camps in the form of the Lightbend ecosystem (very much pragmatic OO/FP hybrid) and the big data ecosystem around Spa

I think you're missing perhaps the biggest camps in the form of the Lightbend ecosystem (very much pragmatic OO/FP hybrid) and the big data ecosystem around Spark. Even though the Lightbend stack also has Java APIs, the Scala APIs are very much their own thing.