> Rust will never replace C/C++ with regard to high performance computing.

I don't buy this. Rust is a lot easier to make more performant than C++ and doesn't really trail behind C in anything but .text size last time I looked. Considering you can easily write C-like Rust that ends up in the same LLVM stack as Clang (more or less) I just don't think this is true outside of some very specific contexts.