Rack pulls, stiff leg deadlifts, and everything else are perfectly valid reasons not to go to the ground.
There's nothing wrong with shortening the range of motion, but then it usually becomes a different excercise or poor technique! The person I was replying to sounded like he was doing it as part of his technique on normal deadlifts.
For the record, I do rack pulls, stiff leg deadlifts, AND normal deadlifts. I also bounce the bar off the chest outside competition
EDIT: When deadlifting from blocks I'd still touch the ground, unless I was trying to emphasize a part of the lift. Anyway, my post was fairly specific to the person I was replying to