Hacking Why do we need to delete a save file from sky3ds+ after inserting a private header ?

[DEEP_STEEL]

Hello guys i was just wondering why do we need to delete a save file after inserting a private header in the sky3ds+.
I have read in many forums that if we do not delete the save file, it will show save data is corrupted in the game, but when i inserted private header in "setting.ini" and " .cfg" file my game works perfectly and does not show any corrupt data.

so i was wondering is there another reason for deleting a save file after inserting a private header in sky3ds+.