Well the way Im thinking is that a turbo/supercharger is always on and always there. Nitrous is usually only used occasionally, either when racing, on the dyno, etc. Turbo/blower is on all the time while driving. Maybe not full boost but its still there.
Nitrous is often a sneaky install so theres that aspect in which its technically cheating.
Ive seen nitrous blow up plenty of parts/motors so theres still breakage.