Same, I have a number of devices here on my desk that will never get a Rust compiler targeting them. With C, it's simple, the "only" thing you have to worry about is what bugs or quirks the C compiler will have on that specific platform, not if there's a compiler at all.

Now I've left embedded development behind me for a while now, things are mostly Linux on relatively modern ARM in the field where I used to do stuff, so Rust would probably be an option there, but I still have a hard time considering them to be "embedded".