Yeah, I was very excited when that was added. I prefer to use use the system Rust as well, and my primary complaint was the hassle of having to manually resolve

Yeah, I was very excited when that was added. I prefer to use use the system Rust as well, and my primary complaint was the hassle of having to manually resolve dependency versions (for packages not in the OS package manager) because Cargo hasn't had great support for restricting packages to ones compatible with your version of Rust. There will always be some issues with package maintainers using new features without realizing it, and/or forgetting to bump the minimum version. But now that there is a standard for how it should be done, I can submit patches to these projects to fix the problems when I encounter them.