The diversity of platforms to read digital texts

Why do I blog this? Working on a chapter in my book about recurring failures of technologies, I quickly created this diagram that shows the different iterations of platforms to read digital texts/content. The point was to show the large diversity of systems, as opposed to the unique "e-book reader" (reading books on photoframe!?). Of course, it's quickly made so I just mapped the different technical objects that enable people to access digital texts/content (based on various form factors, devices). I also avoided overloading the diagram by only adding seminal devices (lots of Apple devices in there) and some recent versions. I certainly missed other platforms.