You are the one focusing in Java, and in your answer proved exactly my point of knowing stacks superficially.

Object pools aren't the only way to reduce memory footprint in Java.

A bit of FFI into host OS syscalls and it is done, or a tiny high performance native library for a custom data structures and ready for the races.

No need to throw away 25 years of tooling and libraries.

Then we can move into languages that offer exactly the same features as C++, like D, Nim, Swift, Eiffel, Ada.