C is considered close to the metal, however the metal it was designed for had the memory model of a PDP-11 which has made it bit a clumsy for handling multi-threaded programming, and having declarations that compile to the native width of a target architecture is kind of burdensome when we've long since settled on 64-bit and don't have to worry so much about getting code to compile for 12-bit, 18-bit, etc. It's also opinionated about certain concepts, like strings being null-terminated which is a design choice that hasn't been replicated in newer languages for a good reason. Rust feels like much-needed clean break from this, in addition to the various safety measures built into its type system
no most of this stuff is still pretty new. It works much better than lots of stuff due to to the nature of the model but we're still waiting for it to be called stable by fedora
If anyone wants to take a stab at building an rpm of gnome-software with the PWA flags enabled so we can have out of the box web apps, that'd be an awesome thing we could do.