Rust doesn’t even have a real GUI library yet, let alone support from common game libraries. C++ supports a hundred times as many compilation targets and platforms.
I would not want to be the one writing that CMakeLists.txt
More generally, if you need to use existing C++ or even C libraries, Rust is at best an awkward fit unless someone else has already built and is actively maintaining the necessary bindings.
I agree that the gaming industry is a place where starting a C++ project still makes sense.