It's not, it's you that persists in wanting update and upgrade to do the same. They don't do the same, but if you want, you can completely forget about update

It's not, it's you that persists in wanting update and upgrade to do the same. They don't do the same, but if you want, you can completely forget about update and just use upgrade, it does an update behind the scenes. But don't try to force kill update just because YOU have no use for it.