DST cancels itself out, leap seconds don't. And sure, being off by a few minutes isn't a big deal, but it gets really annoying for day-to-day life when it is o

DST cancels itself out, leap seconds don't. And sure, being off by a few minutes isn't a big deal, but it gets really annoying for day-to-day life when it is off by a few hours. Suddenly your "midnight" is happening at solar noon!