I think if you are on a green field and do not rely on specific i.e. libraries that are not there yet in Rust, I would have a hard time finding good reasons to

I think if you are on a green field and do not rely on specific i.e. libraries that are not there yet in Rust, I would have a hard time finding good reasons to use C++ over Rust. Mainly I guess if you have really good C++ programmers who are not interested in Rust. If you are not on a green field, stuff gets complicated. If you have a really good Rust programmer on the team, that is willing to take care of the language interop it can work well, if you have a bunch of Rust learners, you might blow up.