He also thought that Rust integrates poorly into project with a deep C++ OOP hierarchy. That is probably still true as well.

Is there any language that can do that? As far as I know there isn’t. You can use SWIG or whatever but it’s just as awful as any Rust/C++ interop. There’s Carbon, but that’s a work in progress.

IMO if you need integration with a deep C++ OOP hierarchy your options are a) give up and just use C++, or b) pain, no matter what language you target.