As brilliant as Steve was, sometimes he was... drumroll... WRONG.
Sometimes he thought things like the Cube would be a good idea. Sometimes he thought removing features such as Firewire on the 13" MBP was a good idea, only to be persuaded to bring it back.
Some people apparently like to hold a tablet in one hand, and operate it with the other, like this.
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Evidently this is difficult to do with the 10" iPad, considering the plethora of accessories attempting to alleviate the problem:
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... And then there are plain retarded ones like this, er, BabyBjorn?
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Who knows, maybe Steve was so absorbed initially in an "OMG we have a tablet!!!" sort of way that he assumed everyone would happily and ceremoniously devote both hands to holding the device and sit there awestruck forever. Maybe he was convinced that there must be a single sweet spot for this device type. Either way, he might have been -- gasp --
wrong.