Well, you either spend energy freeing stuff or you waste some memory. It's a tradeoff, that you can trivially set with a single flag in Java.

In pretty much every other runtime's case you are stuck with whatever their GC uses, and almost every other GC is far less advanced than the JVM's implementationS. And manual memory management is not free of tradeoffs either, e.g. RAII can have pretty long destruct chains in both C++ and Rust.