[pjmlp]

I only played with Scala but never found a good business reason to actually use it.

Personally I rather not be in the bleeding edge and not having to deal with interop issues, or missing tooling.

[pkolaczk]

The whole point of Scala are its advanced features like implicits, higher kinds and macros, and not just syntactic sugar like in Kotlin. Therefore you won't appreciate Scala by just shortly playing with it.

Also in 2018 interop issues or missing tooling problems are long gone.

[pjmlp]

I am well aware of those features.

Only Scala shops can make effective use of them, and I am yet to do a project where Scala libraries were even considered.