Really enjoyed Robin Sloan's "Spring '83" proposal: https://www.robinsloan.com/lab/specifying-spring-83
I must say it is such a breath of fresh air to read an alt-web proposal that's not written from the tech "outward" - it puts writers and visual designers into a creative mode ("what are different shapes and sizes we could let people author in?"), rather than say Gemini which put programmers into a creative mode ("how few lines of code can i make a client or server in?"). I think that's valuable.

I like how elegantly the "collage" layout pattern does away with expectations of chronological-ness or hierarchical-ness, there's something deep to that. And the "whatever you can do with HTML in ~2000 bytes, go wild, use colors and text sizes and formatting" is liberating exactly where the old~new tech focused protocols weren't. I suspect a lot more people would enjoy creating in this format.

Looking at someone's web-based attempt at a Spring '83 client here: https://spring83.mozz.us
Looks like it allows live JS, which is against the spec (and maybe just happens due to it being implemented in a browser).
Realizing that "all clients can author the same kind of content they are reading" is, nontrivial to implement though it may be, an important kind of ideological flag in the sand, even if in this case (bc Spring's data format is HTML) it sucks to write HTML on a phone keyboard.