You can also easily have Objective-C, C, and C++ in the same Swift project and have them interop. That’s a feature of Swift. But adding their numbers together wouldn’t make sense.
I like where Scala 3 is headed (finally). Martin seems to realize that the simpler "direct" programming model is better and that will make the language more attractive to regular people who aren't FP purists. Though it does feel like it might be too little too late.
Doesn't really bring benefit. With Java you are more quickly useful in C++ and can write server apps without fuss. Very little benefit in using a different language when Java literally does the same and is used everywhere else.
But you can easily have both of them in the same project (e.g. when slowly moving to kotlin) and have them interop.