@mario Stories != Posts though, these are ephemeral stories, not posts.
Stories are not displayed in timelines as a regular post, they are a chronological collection of photos/video that can have different durations or attributes like disabled comments or actions ("swipe up" to be redirected to a custom url a user can set).
Ephemeral posts that get deleted are still pretty cool, but the UI/UX of :pixelfed: Stories are quite different than a simple expiry date.