and no one wants a person with a big screen to have battery life.
Not necessarily true. I have a 15" MBP, and I get about 5 hours of battery life running various apps simultaneously. Not to mention that this battery has hit over 400 cycle counts, and still holds about 90% of its original charge.
Does anyone actually like a laptop this size?
Higher screen resolution, and the fact that the larger models tend to support faster processors.
'luggable' would be the better word
If you think a 15" PB is heavy, get an older Thinkpad, like a 600E, or an A21M. Although a real luggable would be a Mac Portable.
