The notebook / laptop argument is an argument over semantics. And we're talking about semantics that have been employed by marketeers. So we're talking about a tempest in a teapot.
I think that, originally, the term "notebook" was used to specify a smaller device that was comfortable enough to carry under the arm as you would a portfolio. They often had fewer spindles / drives / accessories to help make them more portable than "laptops". In those days, some of the laptops were damned big. I had a gas plasma display Toshiba "laptop" (80386-based) that was not battery powered that had to weigh the better part of 20 pounds. Interestingly enough, "notebook" is now used by some to denote a computer that should not be used on the lap but on a table or tray. Why? Heat. Some of the Dell I7500s will burn a hole in your trousers if you try to hold them on your lap. Besides, they don't fit well on most people's laps. I'm 77" tall and weigh 200 pounds (So you know my lap space isn't taken up by belly.), and my I7500 works well enough on my lap. But my little wife wouldn't be able to use this unit on her lap. And neither of us wants to use it that way, at least not without a lap board.
Regards,
Jim