Good points, thanks, I updated the table.
Regarding the extra lines.
"Work Time" I think is extremely variable depending on usage and normally extremely optimistically estimated by the makers so I'd rather refer people to the battery capacity figure.
"Text Formats", well if it runs Android then it can open virtually anything, just install the right app. Sony is the only exception here, I don't think it deserves an extra line in the table
"USB Host",
I read that there are quite a few variables here and someone owning a device would have to provide that information (implying the device must actually exist) since it's unlikely we will learn that from the manufacturers/vendors. Also you may get a bastardised update that removes the support, or one that adds it, so this feature seems quite changeable, unlike, say, memory which they will not rip out of your PCB
