the fact is that this is a terrible feedback loop, because every time you started late, but manage to finish on time, it is reinforcing the idea that you're "good" and can manage it even if you start late! This self-reinforcing condition makes you later next time, but because of your capability, you still make it on time.

But at some point, you either stop procrastinating as you find the absolute limit, or fail outright (which is why survivorship bias exists if you look at the student body and see the amount of procrastination).

The good part of it is that you learn to ... actually be faster. Because inverse side is that you start well in advance and then slowly use all the available time for the thing you are doing. Essentially, getting the same result, but in exchange of massive amount of time.

Only being able to work under pressure is textbook ADHD.

Yes you're right, I didn't have the self-insight to understand or accept this until a decade after I graduated. It's still surprising to me that it's so obvious to outsiders but was so unclear to me.