The_Editor thought excitedly:
...Then again, if os4 boots as fast as they say it will.. is it neccessary?
;-) Well, let's say that while you're typing in a word processor, you're also rendering something complex in the background, and each frame takes a couple of hours to finish. The current frame has been rendering for the last ninety minutes.
:-( Now your word processor freezes up. Rebooting would waste ninety minutes of rendering time, regardless of how quickly it reboots.