What flaws has the language Kotlin?

Question

The most ugly aspect of kotlin is that it's classes, though still passed by reference, are declared FINAL by default which makes it unable to make changes to the value of the Base class from any class that extends it. The devs should find a way to change that else converting from Java to kotlin will be a nightmare since the feature remains in Java
@kotlin
Be statically typed, suppress the getter and setter and also declare all the classes to be final
But by the end of the KotliN madness, Java will take over

Answer 1

missing the beauty of the classical Java

Answer 2

kotlin may come with different improvements but Java is still Java

Answer 3

Java is already hard, imagine kotlin

Answer 4

thanks for the insight