Apple’s iPad has undergone a number of transitions in its lifetime, and has popped up in an array of variations since its 2010 debut. The first iPad had a 9.7” display, and since then, there have been smaller (mini) and larger (Pro) iPads — to say nothing of how much thinner and lighter they’ve become over the years. But there has always been a 9.7” “standard” iPad. That size has basically defined how large a…