I think an issue is a different mindset. I haven't done OOP for a long time. After Haskell, Scala feels a bit verbose and actually rather complex. I had a go at

I think an issue is a different mindset. I haven't done OOP for a long time. After Haskell, Scala feels a bit verbose and actually rather complex. I had a go at Scala a few years ago, it felt like a breeze after Java and C++. I think I can confirm your perception that that's a question of familiarity. I'm now embracing the JVM, and Frege is not an option. It'll be a mid-term transition for me. But it's already nice to rediscover some functional paradigms in Scala and apparently sane design choices when it comes to mixing the object-oriented with the functional style, at least I think I like it better than OCaml. I'm bothered by Scala's performance as compared with Java. Kotlin's seems to be in parity with Scala in this context, but both by an order of magnitude off from Java's. However, I can't vouch for the "benchmarks" I've come across and I'm not yet familiar enough with either to conclude which features could be detrimental to JVM's performance. I would wholeheartedly appreciate your take on that.