Usenet, IRC, mailing lists. and TUI email clients are fading away because they have horrible UX (and UI in most cases). The internet used to be a nerdy space, but now it’s for everybody: from your youngest to your oldest citizens, from the least technically adept to the most technically adept, and everyone in between. You can mourn the death of technologies and solutions written for another era if you wish, but that doesn’t make you better nor right. It just makes you bitter (or salty if that’s what the kids say nowadays).