Anecdotal: definitely a long way to go for systems programming, non-trivial firmware, and critical systems in general. And I say this as a huge fan of LLMs in general.

I work as a FW Eng and while they've been of immense value in scripting especially (fuck you powershell), I can only use them as a better autocomplete on our C codebase. Sometimes I'd chat with the codebase, but that's a huge hit or miss.