Although the imagination immediately goes to a sort of cancellation in post-production (which will also come with the years, for sure), the feature is simpler but still appreciated by those who suffer it.
With iOS 15, Apple is introducing more granular control over people and places that appear in photo memories, allowing you to adjust who randomly appears in the Photos app and Photos widget.
In versions prior to iOS 15 you can select "Suggest fewer memories like this" when viewing a memory in the "For You" section of Photos or completely delete a photo from photo suggestions, but in iOS 15 you can choose to present to a specific person less often.
When viewing the “For you” section of the Photos app, you can tap a picture with a person and select the “Show less of this person” option to prevent that person from appearing as often. The “Remove from featured photos” option prevents a specific photo from reappearing.
These new controls to better manage what appears as a featured image will come in handy when an unpleasant memory pops up, perhaps one that shows a former partner or a place that has a negative association.
Over the years, people have complained about the Memories feature in the Photos app and some of the people it chooses to offer.