Embedded Rust in Production?

I'm ignorant about Rust, but to me it's just static type language akin to C#. And C# has IOT library which seems to target Rust most usual use case, namely on embedded platform. C# also has memory safety just like Rust.

So why do we need Rust at all? What's the use case for it?

Anything that I'm missing?

You're missing that Rust has safety in terms of multithreading, which C# doesn't have. Writing a data race in C# is the default, writing thread safe code takes work. In Rust, the default is that it's safe, you have to jump through a lot of hoops to try to make it not thread safe. The same is true for async, which in C# is also a problem.

In all C# codebases I've seen, you have threads and tasks, and you often run into multiple threads or tasks holding a mutable reference to the same data. That's not legal in Rust without synchronization/locking.

If you don't believe me, just spin up a new main.rs file and write code that has a data race.