I do think it's a shame that Gemini doesn't have images and richer text, but maybe it would be even less popular/successful if it had those. Gemini won't be the last of these simple protocols so it's a useful learning opportunity.

My project at the moment is kind of related to these "simple web" ideas. Instead of giving up on HTML altogether I'm making a simple web browser, to see if there's a way to render even relatively complex existing pages, like Wikipedia or news sites, without needing to implement much or any CSS. A bit like "reader mode". (link if you are interested: https://codeberg.org/kaimac/weaver)