But one challenge I've struggled with is how to generate full-content RSS quickly. I like that my blog's RSS includes the full blog post (since that's how I like reading posts) but Emacs wants to recompile every post every time I update the site—that takes minutes.
Edit: Another way of saying this is blogging and blog-consumption directly on Emacs. I think it could be possible.
1. a request to return org-mode data (or for requests to contain it in a mechanically distinguishable manner, an option if your normal output is org-mode plus some JavaScript that renders the page from org-mode)
2. some Emacs code to populate a buffer with org-mode data extracted from an HTTP request
That's it. Neither of those are technically difficult. Although there's lots of room for improvement, and that's where people might start to get interested. For example, you could develop org-mode as an alternative to Jupyter notebooks.
For those that write (or interested in writing) quite a bit of prose in orgmode / markdown, this emacs theme I just discovered today is mindblowing: https://github.com/kunalb/poet
Finally, don't forget about Flyspell for spell checking but also WriteGood mode which allows you to list weasel words or repetitions and have them underlined by emacs amongst other things.