Most memory safety errors are from not being able to test things like whether you are really dropping references in all cases or whether your C++ additions are interacting with each other. C is not safe but it is safer than C++. Rust is not going to stop all run away memory possibilities but it isn't going to hide them like a JS GC.

If your goal is to ship to most users something that kind of works then there are certainly complex solutions that will do that.. If your goal is memory safety that's more like every device working as expected which is done with less bloat not more.