Rust solves a real problem that has plagued software for decades (or so I'm told, I'm not a Rust user), but that can be true while everything else you said is also true. I don't plan on picking up Rust either, and yes a combo like C#/C(++) is incredibly potent, and Rust is ages away from replacing C.
A language ends up being the sum of its parts though. C# is "write once, jobs everywhere". Great serverside platform with .NET 5. Native on the most popular desktop platform, produces iOS apps and games. It's industrial-strength in language design. Good IDE support, good backwards compatibility (or side by side support). And also importantly, like my experience writing Python, I enjoy writing C#.
[0]https://en.wikipedia.org/wiki/Timeline_of_programming_langua...