I’ll start:

  • RSS and blogs, news vs. social media
  • XMPP vs. WhatsApp/FB messenger/Snapchat
  • IRC vs. Matrix, Teams, Discord etc.
  • Forums vs. Social media, Reddit, Lemmy(?)
  • Definitely. Programmers and super users, tend to be the kind of people that want configurability and are able (and even enjoy) to figure out what they are trying to do by themselves. If they have a question or a problem, the solution is usually one search away. But that doesn’t fly for the average person who wants the thing to work out of the box without having to dig into menus and settings.