We build and scaled a startup based on Scala code and successfully sold it, so - with all the Scala problems [0] in mind - Scala will always have a place in my heart. Using IntelliJ since a decade+ I wish those guys the very best with Kotlin.
[0] Binary incompatibilities, very very slow compilation speed, atrocious build tool
[0] Binary incompatibilities, very very slow compilation speed, atrocious build tool