Before reading the content behind this link, I thought for a few minutes about why people procrastinate. I came up with a few reasons:
1. Fewer context switches. A true procrastinator only works on the single next thing they have to get done, so they don't have to switch between tasks as often. Imagine the simplicity of popping tasks off of a priority queue compared to some sort of coroutine setup.
2. Saves work. Occasionally, the things that people have to do get cancelled. The procrastinator never has to do these things that got cancelled at the last minute, while the person who works ahead does.
3. Some kinds of work are easier later. Particularly in collaborative environments, getting things done is much easier when other people have already done some/most of the hard works. Examples of this include my problem sets for school. However, there is less reward for doing things after others. For instance, there is less intrinsic reward for being aided by others than for just doing everything myself on my problem sets, and it is much easier (and much less valuable) to do something like building a light bulb now than it was 100 years ago.