I think it is probably closer to safety critcal than it is to the middleground of safety related, where the sloc hits millions so you want boost or a thick stdl

I think it is probably closer to safety critcal than it is to the middleground of safety related, where the sloc hits millions so you want boost or a thick stdlib plus posix but its still controlled enough you develop airgapped and worry about number of library contributors, trustedness and mostly futile code inspections of entire libraries. Even for server backends the rust team has expressed concern about the security implications of having such deeply nested dependency trees with so many authors.