Although I don't care if a tablet has an SD card slot or not, if I were a manufacturer I would insist on adding a micro-SD slot to my tablets simply because people are so use to having them come standard on smartphones and many other electronic devices. It gets expensive adding more RAM, so they could add an inexpensive micro-SD slot as an alternative. Assuming of course that Android can deal properly with these slots. If Android/iOS are flaky with a port I would leave it out of the spec.