Username or EmailPassword
I just moved my laptop from my office downstairs to the bedroom upstairs, and no matter how you cut it, it's still much less of a pain than a SFF. Besides, I actually have my laptop on my "lap" in bed right now. I don't know how you're going to manage that with a SFF.
You're right, I'll concede that there is a gap here. Though I maintain in many situations where someone opts for an 8-10lb laptop they'd be served well by an SFF (and they'll be getting better and better with well integrated bluetooth: the keyboard is the big difficulty imo). And still, when you can fit everything a 10lb laptop has in a 7-8lb package for a good price, you have to wonder...
A PC example, not that I suggest them, is the Inspiron 9200.