You haven't said what kind of writing you're dealing with. Fiction? Non-fiction? If the former, I'd say (with respect) that it's useless. If the latter, many educational texts do this already, don't they - with chapter summaries, etc.?
Regarding fiction, the reason for my opinion is that your model does not account for the gradual accretion of meaning (for want of a better word) and the pleasure (yes, the purpose of a book is also that) that comes from a piece being its "best" length. A short story is a short story, a novel is a novel. Try to cut a novel and you end up with a mess. The point is not simply the "story", but the whole shape of the thing, its symbols, patterns, and the gaps between the parts. Reduce it and those are diminished.
Having to write a sales pitch for a book is bad enough, it's like saying to Bach "OK, you've got 5 seconds. The Whatenburg?"
I have seen models like yours recommended for use in the creation process of a piece of work, but not as a mode of presentation, except for the purpose of selling (blurb, synopsis, 1st 3 chapters etc).
If I'm missing the point, feel free to disambiguate!