Glossary
Watched folder
A folder you explicitly ask Autopilot to keep an eye on.
Watching a folder means the app pays attention to that location, not to the entire disk. The scope is the point. Downloads is a common choice. A directory of build output you can regenerate is another. A folder of irreplaceable originals is a poor one.
In Disk Housekeeper, the watched folder is what Autopilot cleans. The preview still happens. The Trash is still the default. The essay Autopilot is a watched folder, not a timer is the longer warning against reading the feature as a schedule.