Mobile Internet Device.
Hmmm... "mobile internet device" is a pretty broad label. By that definition, I suppose all smartphones and iPads (the 3G ones, anyway) are a "mobile internet device."
Not disputing you... I'm sure you're correct (thank you)... just seems like a broad label maybe intended to fit a narrower category.
Whether it's accurate by literal definition or not, That's what it stands for.
It can apply to almost anything that is "mobile", that connects to the "internet", and that is a "device" .. they have other phrases that narrow it down too, such as notebook, netbook, smartbook, etc.. It itself is a broad label, not a category, imho.