I am not GP poster. I find pron points interesting even if I work in the gamedev on game engines. If you don't mind I will try to explain how I see them interesting. Since I have not worked on Rust systems I will stick to C++.
Note his example elsewhere in this discussion of 2 projects done at same time in Java and Rust and the complaint that Rust system used too many locks. This can happen in C++ too. But why it does not happen in (my) practice? Because C++ evolved to not use locks in large scale parallel systems. This was said from mainstage conferences keynotes at least since 2013 [1]. So there is "normal C++" and "C++ that works at large scale" and they are not the same C++ languages. The performance scales between them are many orders of magnitude. Imho it does not mean that Java anywhere near the best of what C++ can do. So here we are talking past each other. pron is correct that Java is not bad and you are correct that you have no reasons to leave Rust.
Note his example elsewhere in this discussion of 2 projects done at same time in Java and Rust and the complaint that Rust system used too many locks. This can happen in C++ too. But why it does not happen in (my) practice? Because C++ evolved to not use locks in large scale parallel systems. This was said from mainstage conferences keynotes at least since 2013 [1]. So there is "normal C++" and "C++ that works at large scale" and they are not the same C++ languages. The performance scales between them are many orders of magnitude. Imho it does not mean that Java anywhere near the best of what C++ can do. So here we are talking past each other. pron is correct that Java is not bad and you are correct that you have no reasons to leave Rust.
1. https://sean-parent.stlab.cc/presentations/2013-09-11-cpp-se...