Actually I believe it had to due with the fact that the Intel PXA270 didn't support USB v2.0 when the 6700's hardware was developed. I know the later generations supported USB v2.0, but I believe the first ones where only v1.1; hence why the main reason the 6700 wasn't 2.0.
FYI, the PXA270 also has USB host functionality built into it too, but few manufacturers chose to implement it. (industrial/enteprise devices and a handful of consumer PDA's (Loox T830, Asus A730, ....))
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xv6800 WM6 Kitchen w/3.35 radio
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