This question is fundamentally flawed. People don't use Kotlin just as "a better Java" (maybe they did in 2017), Kotlin is an independent language that runs on

This question is fundamentally flawed. People don't use Kotlin just as "a better Java" (maybe they did in 2017), Kotlin is an independent language that runs on the JVM, as well as other targets. Most Kotlin devs don't see Java and Kotlin in competition with each other or wish to use Java if it only had feature X.