You know why they “tombstone”? (By the way, they don’t replace with a tombstone marker but instead add the marker.)
Because if you “accidentally” deleted something and then decided you wanted it back, you’d get really mad if they couldn’t do that. If they immediately deleted it, you couldn’t ever get it back
The copies and deep copies are for a similar reason: Some engineer accidentally deletes a bunch of data, it’s really nice to have a backup so you don’t lose everything.
You know why they “tombstone”? (By the way, they don’t replace with a tombstone marker but instead add the marker.)
Because if you “accidentally” deleted something and then decided you wanted it back, you’d get really mad if they couldn’t do that. If they immediately deleted it, you couldn’t ever get it back
The copies and deep copies are for a similar reason: Some engineer accidentally deletes a bunch of data, it’s really nice to have a backup so you don’t lose everything.