[lmm]

This is wrong. It might look like that from afar, but what seems like complex features in Scala are almost always actually combinations of simple, powerful features, and the combination works exactly the way you'd expect once you understand the simple features. (Almost all of the concrete examples people give of "Scala complexity" are actually library features implemented in plain Scala, and if you get confused you can always click through to the source and read how they're implemented, because they're just plain old code). Whereas in Kotlin they really do just implement every use case as a separate language-level feature.