> it just works.
Going to push back on this line specifically, HN has a number of issues. They're not dealbreakers, but they're also not particularly hard to fix with modern HTML. HN has generally kind of bad accessibility/semantics, it's pretty frustrating to use on mobile, and it degrades kind of poorly without Javascript (collapsing thread buttons still appear even though they don't work, also, collapsing thread buttons don't work without JS).
HN is (unironically) a great example of how kind of hacky you can make something and how little you can iterate on it while people still are mostly able to use it for its intended purpose. And (with the exception of maybe its blind accessibility problems) it should be held up as a great example of that.
But it's not a good example of "do things simply and they'll just work well." If anything, HN is a great example of why stuff like tables were abandoned. And the HTML isn't even that simple, this must have been a royal pain to build, everything everywhere is another embedded table. It's a weird dig at how bad some major websites have become that people don't see HN's HTML as bloated or convoluted.
Ever really dug into how HN threading works? Everything is a top-level comment, and it inserts transparent images to create the illusion of indentation. It's a wildly out-of-left-field solution that makes parsing out and styling threads way harder than it needs to be. Seriously, I've spent way too much time trying to figure out how to make CSS selectors for custom user-styling work on child comments/replies on a site that is supposed to be displaying a comment tree in the DOM tree. There's a one-to-one mapping there, you don't really need a complicated visual slight-of-hand to display this information; just put the comments in the tree.
Again, not to get mad at HN; but I think people use it as a positive example in the wrong situations. HN has bad HTML with obvious downsides that would be pretty easy to fix, but it turns out that creating an elegant website and filing off the rough edges is actually a really small part of running a community, and doesn't matter that much in the long run when compared to other things you could be doing to foster that community (like moderation/curation), and that is a very good lesson for tech people to learn from HN. But nobody should praise the HTML on this site, there are much better examples out there on the web of sites that use simple HTML to great effect.
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> (Applications are a different matter obviously)
Much more minor push-back but I actually would love to see more applications embrace the interactive document model even when fully native and fully offline. Not all applications, but a bunch of them. Stuff like calculators, calendars, even bigger applications like database software/image viewers/file browsers, etc...
User-accessible stylesheets for applications, user-accessible scraping tools for applications, etc... I think there's a lot of potential for user computing hidden behind a willingness to say, "no, many applications are just text displayed in tree/table form when you think about it, and the app/document divide was always sort of nonsense."