Comment by morshu9001
1 day ago
Language can be bottleneck if there's something huge missing from it that you need, like how many of them didn't have first class support for cooperative multitasking, or maybe you need it to be compiled, or not compiled, or GC vs no GC. Go started out with solid greenthreading, while afaik no major lang/runtime had something comparable at the time (Java now does supposedly).
The thing people tend to overvalue is the little syntax differences, like how Scala wanted to be a nicer Java, or even ObjC vs Swift before the latter got async/await.
I'll be the one to nickpick, but Scala never intended to be a nicer Java. It was and still is an academic exercise in compiler and language theory. Also, judging by Kotlin's decent strides, "little Syntex differences" get you a long way on a competent VM/Runtime/stdlib.
Kotlin's important feature is the cooperative multitasking. Java code has been mangled all these years to work around not having that. I don't think many would justify the switch to Kotlin otherwise.