a must for who? 100 million people get plenty done with ARM based iPads and their 2048-by-1536 display. Why wouldn't' the A7 be powerful enough for a $799 11" MacBook Air, 8 hour battery, retina display, under 2 lbs? No windows support, office or adobe. And no thunderbolt. But runs everything in the mac app store within a couple of months of launch. Optional 4G LTE version. Apple would sell millions of them.