Steve's body position looked awkward too. He really had to get his legs crossed tightly and keep his leg near his body to prop that device up so it was facing him.
This reminds me, nearly every Apple video has the iPad on the leg of somebody sitting crosslegged, sort of stuck there with magic velcro or something. Having balanced a fair share of laptops on my legs, and not enjoying the precariousness of it, I would be a bit frightened of hammering on a $600 slab with an unprotected glass front without securing it with at least one of my hands. And typing with one hand, even on a physical keyboard, stinks.
