I had pretty much the same question already answered by you in the previous posts.
But given that Actors were deprecated in favor of Akka Actors (I guess this is the reason Actors chapter has been removed from the new release). In your book, do you provide some guidance to Scala newcomers where to look for the features unavailable in the core Scala? I am referring to Scala frameworks available.
For example a reference to Scala Index https://index.scala-lang.org/
could point Scala developers in the right direction.