Many of them have been reclaimed. Check out the "awesome self hosting" GitHub repo.
Podcasts: audiobookshelf
Music: 500 different subsonic clients, many of which are good. Or some fun tuis
Feed readers: lol, more than there are grains of sand in Torvalds' flippers
Note taking: again innumerable, also, just use nvim or emacs of course
Chat: tons of very good self hosted options that can save orgs thousands a month.
Rather than build your own from scratch, rediscovering already solved issues, why not contribute to or fork a FOSS project? LLMs make it easy easier to get up to speed on large projects
Audiobookshelf is a web app! Like, if you had a good TUI music player, I don't think you'd be rebutting my thesis here. I don't doubt anybody's ability to build TUIs.
The point of the post is the emacsification of the native macOS (and Windows, I assume) environment. Totally reasonable not to care that it's occurring, that's not really responsive to the post, is it?