It all depends.
They say it in order to say "I am cutting out massive details and nuances just to get to the point- for your benefit [because maybe they know that they have already rabbited on too long]".
Some folks, especially young folks, do tell long stories. And the story ends with ...what should have been the first thing out of their mouth.
Ideally everyone would organize their thoughts before they opened their mouths, and then they would decide if what they are about to say is for business, or for entertainment. If its for business then tell the story END, beginning, middle. If its for entertainment tell it beginning, middle, end (end with the punchline). If you go business mode then -the end of the story is usually all that you need- just tell the nub- and folks figure out the rest on their own, or don't need to know it in the first place.