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My goal is to compare Kotlin with the current version of Java along with any Java libs that are commonly used (such as Lombok). I have mentioned the fact that some teams are still on older versions of Java just to highlight that not every developer can access the features of the latest Java release.

Unless it's Android, if they can't access the latest features of Java they more than likely can't access the latest features of Kotlin either.

That's not always the case, since Kotlin can generate Java 6 compatible bytecode.

You can compile Kotlin to target any of these JVMs, so of course it's relevant. If you're limited to using Java 6 every day, Kotlin is a game changer. If you can target Java 13, less so.

It's a bad case of jvm and lib dependencies and do reflect badly.