The ability to swap images but not text seems arbitrary.
You could imagine a system more like the notification tray on iOS/Android where at any time a notification can appear, be edited, timeout, or be deleted.
Your email inbox could be like that. The email saying "Your parcel has been dispatched" could be edited to say "Your parcel has been delivered".
When you refund something you've bought, the original purchase receipt could be crossed out or hidden. When you get invited to a wedding but then the wedding is cancelled, the original invite could be deleted, etc.