You know, I really agree with a lot of this. It's maybe not an unreasonable argument to make that maybe OO-heavy or Akka-ish Scala might be a better investment for a lot of people, considering the weight and momentum of the communities maintaining these, and these expressiveness of the language in these domains.

But I think if we're only talking about pure FP, or at least something close to very pure, I think you're still getting a better deal than Haskell, even in spite of all those quite legitimate downsides you mentioned. My own personal biases mean that I will always prefer pure FP to anything else (I personally didn't love Akka and Play when I used them briefly), but that's an argument for another day.