problem isn't that stuff, it is how java is engineered, it was made for the 80's

gaming industry is huge, but you can't with java because autoboxing everywhere, no value type, and no specialized generics

same for serverless, you can't because you have to ship heavy runtime

same for machinelearning, you can't do math because lack of value type

etc etc etc

Java tried to fix all problems, but they forgot the essential stuff, performance and efficiency