It is a filter against rotting in chronic/toxic/boring things.
Too bad people are trying to kill this instinct and rape themselves instead of using it to their own benefit.
It can sometimes eliminate or reduce recurrent tasks, IE procrastinate getting a haircut: fewer haircuts / year. Procrastinate cleaning or laundry: less total time spent since you can do more at once.
There's always a small chance the task will entirely disappear (business priorities shift). In those cases, procrastination can actually be helpful.