> the only reasons to use C++ over Rust are for compatibility with existing code/libraries, or lack of Rust expertise on the team and no time to learn Rust But

> the only reasons to use C++ over Rust are for compatibility with existing code/libraries, or lack of Rust expertise on the team and no time to learn Rust But these are huge reasons. It is the difference between theory and practice. In theory you can just replace C++ with Rust. In practice, it can be difficult because of those reasons. Choosing a language isn't just about the language, but about the entire ecosystem and community.