The end user doesn't know or care about implementation details. It's bikeshedding that nobody cares about except the developers themselves. Facebook could have

The end user doesn't know or care about implementation details. It's bikeshedding that nobody cares about except the developers themselves. Facebook could have built their web app with Angular or Ember or whatever and nobody would give a shit except developers. Even as a developer I don't give a shit about what framework a web app I'm using is made with as long as it works (if it's horribly broken then I know what to avoid).