alt Hacker NewsJava-the-language blows, but Kotlin does not, and Java-the-platform is on the Pareto frontier of oldest-yet-most-usable open-source ecosystems. I prefer Rust, and the gaps where it doesn't apply, C# fits my use cases better, but Kotlin/JVM is a rock solid development platform.
I once tried Kotlin for a pet project, but after a while switched it back to Java, since it's good enough, IDE support is better, it's much faster.
I guess if you use/like Intellij it's ok.