> Touch devices don't have that, so you get the basic functionality exposed, but other stuff isn't as discoverable. I don't think this is as much of a problem as people make it out to be. They've managed to keep the iPad just as accessible to everyone, and they prod you occasionally with notifications from the Tips app for people who are willing to learn more.

Indeed, I'd say the opposite: Most older folks simply do not discover stuff, or do so very rarely. They ask someone to show them how to do something, they memorize it, and they generalized/abstract from that only slightly. So they aren't missing the discoverability when changing to the tablet, while gaining a bit more intuition for swiping compared to the mouse.