That doesn't seem to answer anything. If human beings procrastinate to feel in control, what of soldiers? They can be happy and fulfilled, work damn hard, and be only doing exactly what they are told. The next question, for you perhaps, is "what do you fear so much about the idea of not being in control of your life?"
A soldier is programmed to be the way they are, their lack of procrastination is beat into them as a response to fear, primarily the fear of death. Do what you’re told or your squad mates will die, your commanding officer will die, and by extension "you" will die. Death is one of the ultimate motivators. That said you get a soldier outside the army life and he finds ways and methods of procrastination that rival the…
That's no more an answer than saying if a painting is has too many chairs in it you balk at looking at it. Balking at not-spontaneous things is a description of what you do, but not why you do that behaviour, right?
that procrastination will flare into an outright rebellion against doing that “THING” that is “required” of me.
This is not explaining that you procrastinate because you feel controlled, this is observing that you feel controlled and observing that you procrastinate, both when (something unspecified) is the case.
Feeling controlled -> procrastination is not a link which must exist, is it? You can imagine people without that link, right?