[mproy]

I agree with what I think is the spirit of what you say, but it's unhelpfully reductive.

Many, many people who meet your criteria in fact are severely lacking in executive function.

Neurological conditions aside, surely you understand that an adult who's developing years formed a healthy "reward system" for accomplishing tasks will have a much easier time getting things done.

While, yes, most of us have the ability to correct past habits and develop discipline ... It's no different than an athlete who began training at an early age versus someone who took up a sport later in life. The difference in skill and ability is predictably and consistently stark.