Counter-point: As not-the-primary-computer, my MBA is plugged in 80% of the time and gets moved from place to place as my crowded workspace dictates. I can't count the number of times I've accidentally yanked the Magsafe connector out trying to move it just out of cable reach because I needed to get at something underneath.

Granted, a lot of that is learned behavior because I know I can yank the Magsafe out without incurring a $500 repair.