One more check. One more read through. One more sense check before you send it. The tone could be sharper. The structure could be clearer. It needs to land right for the audience.
All logical. All rational. All completely endless.
So the tabs stay open. The drafts sit in progress.
The things that are done could always be better.
And in the back of your mind, the list of things you still need to go back to is running constantly.