Who knows what matters.
A secret is only useful if the right people know it—and the wrong people do not magically acquire it later.
Persistent memory
The scene ends.
The history does not.
A fictional relationship stops feeling real the moment someone forgets the thing that should have changed them.
Feelings need history.
A grudge without a cause is noise. Affection without a past is decoration.
Objects do not teleport because the model got bored.
Locations, possession and scene facts belong in structured state so convenient nonsense has less room to become canon.