It comes down to size. The vast majority of the hundreds of millions of people who use tech every day are just fine with having two primary computing devices: One for your pocket and one for your desk. Tablets are trying (and failing) to be portable enough to go everywhere, yet large enough to be multipurpose. Despite all the keyboard origami and elaborate ways to make your tablet into a laptop, it isn’t one. Stop trying. Consumers know it — the latest sales data has shown that worldwide tablet sales may have already peaked. PCs took a full three decades to reach market saturation, whereas tablets may have already topped off at the four-year mark.