To get proper macros.

Scheme already has hygenic macros, I don't get why you'd vibecode a worse (less battle tested, llm-generated) replacement. I'm not sure why this hit the front-page, to be honest, because it doesn't seem noteworthy or interesting (Anyone and their mother can vibecode something like this in eight hours)

Scheme doesn't have Rust semantics, though?

this is not a replacement for scheme, it's simply an alternative syntax for rust

Because Rust syntax is ugly and overcomplicated.