That is certainly true. In fact that's partially the reason why I'm still using Ruby for some of my projects. Kotlin though has the benefit of being able to use all the Java ecosystem.

I didn't say "perfect" I said "very well designed". I don't think perfect exists. My statement also was strictly about the languages themselves. Languages pretty much never fully go away because there is always some amazingly well done library that will be needed for virtually ever. Just look at all the math stuff done in Fortran. Sorry, I should have been clearer.

Rust has those i believe :)

This is one of the reasons I use python instead of kotlin. But I hope libraries will catch up at some point.

I don't think kotlin is TypeScript. Kotlin adds to java some nice things like coroutines, it is not only null safetly, functional programming and some sintax sugar. And also compiles to javascript and in the future to native.