> ... and of course this is happening as over the last ~2 decades we mostly figured out that most of that amazing freedom on the client-side does not worth it

It's not that, at least in my opinion, it's that we love (what we perceive as) new and shiny things. For the last ten years with Angular, React, Vue et al., new waves of developers have forgotten that you can output stuff directly from the server to the browser outside of "APIs".

This implementation is "dumb" to me. Feels like the only innovation is using SSE, otherwise it's a `selector.onClick(() => {selector.outerHTML = await (fetch(endpoint)).json()});`. That's most of the functionality right there. You can even use native HTML element attributes instead of doing .onClick https://developer.mozilla.org/en-US/docs/Web/API/Element/cli....

I really don't see any benefit to using this.