[mystified5016]

IME, it's sort of like the difference between C and C#.

Kotlin is incredibly expressive and can get quite complicated. Java is a bit more brutally simple (and obviously more verbose).

As a C# dev primarily, I love Kotlin, and I've always hated Java despite it being the very first language I learned.

I wouldn't call Kotlin simple by any stretch of the imagination. It's just a very high-level language.