What is the effectiveness of presenting most of a short story as a flashback?

Question

What is the effectiveness of presenting most of a short story as a flashback?

Answer 1

In my opinion, It gives you not only a way to have an omnipotent view of the events from which to tell your story from, but it also provides an opportunity to show how the events of the flashback changed the characters when the action of the story returns to the present tense.