Our company builds a wearable device using an NRF5x chip, and our firmware is written in C. We are moving to Rust for our newest device, in order to run graphical output and RT operations. It is looking pretty sweet!
If you want maturity, use C. The nice thing about Zig is it's a "better C" with better interoperability & less complexity compared to Rust. Here's someone who has rewritten keyboard firmware from Rust to Zig.
> Why not Rust? If you can use Rust, ignore Carbon.
So that's probably one reason.
[1]: https://github.com/carbon-language/carbon-lang/blob/trunk/do...
1. Carbon does not aim to replace C. It targets C++ devs. 2. Carbon is still just an idea. Well, more than an idea, but less than ready. 3. Carbon is meant for people who cannot move to something like Rust. They don't intend to compete in enviroments that have modern options.