Idea / Pre-RFC: Null-free pointer and Zeroable reference

embedded != safety critical

The Rust Foundation literally said

The Rust Foundation published exactly one of the four things you linked. I'm not even going to bother looking at the rest of your response, as it's clear you're saying things that are simply not true. Show me a safety standard that is generally accepted in Rust and that prohibits all assembly whatsoever. I guarantee you it's the standard that is the problem.