There are numerous places where editing and writing intersect. One of these is when a manuscript reads as if it’s been written in a rush. Action, action, line of dialogue, action. The scene might call for fast-paced movement, but weaving in a little description or POV won’t necessarily slow down the pacing. On the contrary, it can save your reader’s wandering eye.
When I edit, I read the jumpy, too rushed text “out loud” in my head. If the writer’s voice is consistent, shows command of the unfolding scene, I make mental smiley faces. But if the narrative feels vacant or confusing–with characters moving like robots–I wonder how the writer has skipped a few steps to get to the end and omitted adequate description. Sometimes writers (and editors) just want to finish their quotas for the day. I feel that pain myself and then suffer for it later when I have to go back and do the job right.
A few times, I’ve been given the task to flesh out stories (mine or someone else’s) where the need to rush to the end is strong. It feels fine when you’re getting down all those words. But then, it’s flat. Diagnosing the problem is easy, but sitting down to fill out empty spaces can be daunting yet thoroughly exciting. One suddenly has lots of room to play. Why not play?
As an example:

First of all, who is Yossi and why does he need to leave? He must be Alexander the Great since he needs to conquer. But also, he fears the elevator. How interesting that there’s only one adjective. Basically, the reader can only gauge so much. This is where you roll up your sleeves and go to town.

Don’t glossy moth carcasses sound awesome? You have to wonder if Yossi is about to engage in some kind of mating ritual. I don’t want to see what comes next. Or maybe I do? It’s not like I ever look away.
Maybe we need a sentence or two about why he needs to leave. Is it just because of the Bichon Frise or is it something else? What’s driving him–aside from what we could assume to be dog sex?

You never know where a story’s going to go, do you? This one definitely isn’t finished.
The moral of the story is to fill in those cracks even if you think your story is fine. In the end, Yossi may have a simple journey from Point A to Point B and we don’t need all this crap. That’s why the delete button is there for your pleasure. Part of the joy of writing is discovery. So what you feel is filler could be the darling touch that the reader will remember forever.
Glossy moth carcasses.