For everybody who doesn't have the context, just note that this is not an accepted langauge change. It's a just project goal, which means it's accepted as something people will work on, but the design might change significantly or it can even be abandoned completely (which is pretty unlikely for this one, to be fair).
I think this one might be at greater risk than usual of being dropped, because it's explicitly mutually exclusive with another accepted project goal (pin ergonomics): https://github.com/rust-lang/rust-project-goals/blob/main/sr...
I think it's absolutely amazing to have insight into long-term goals like this for open source projects. For one thing, it can help you plan your tech stack, and can even be a source of inspiration on what sorts of topics to learn and what sorts of research to do.