[lindig]

Python is distributed in source code and it sounds like Scala dependencies are distributed as JAR files. The compatibility problems when moving compilers are not entirely unexpected, I'd say.

[high_density]

but scala's cousin kotlin doesn't seem to suffer from this a lot... kotlin library-packages don't have kotlin-version to their download link... maybe I'm missing something?

[fiddlerwoaroof]

Kotlin is a “better Java”. Scala is sort of a tug of war between a better Java and a worse Haskell.

More importantly Kotlin is designed to be as straightforwardly compatible with Java at the bytecode level as possible. Scala isnt.