That's the ruthlessly-pragmatic reason to not "accept this side of who he is": nobody else is going to, especially not the people who pay him.
So while a manager may dislike that they perceive someone to be slacking off, it doesn't necessarily mean the person isn't providing a lot of value to the company. Value produced and hours worked are fairly loosely correlated for knowledge workers.
If you were running a startup, would you rather have 12 focused hours per day from a mediocre programmer or 2 from Linus Torvalds?
What I'm doing with my extra time is not productive by any measure and although it makes me really good at producing random facts at dinner parties....I can't see much else gained by the time I waste.
Very disciplined people might be able to. You can't discipline yourself into being more disciplined. Accept that first.
I think there is: different people have differently tuned reward-centres in the brain.
The book "the procrastination equation" by Piers Steel tries to capture those differences in equation form. Although it's probably faux-math, the key idea seems good to me: procrastinators are more sensitive to the time-until-reward dimension of a given rational choice.
And of course, being physiologically different is not an excuse to procrastinate away. Once we understand the nature of the beast, we can game our brain (as the book describes), and (I hope) we can then maybe benefit from brain plasticity to get better at this stuff over time.