because i'd consider myself above average in terms of intelligence and ambition but i still fall into the procrastination trap often. now you might say that this makes me in fact "stupid" per your defininition (or maybe arrogant as i overestimate myself) but i see this in other people as well.
i also would not say that being "productive" as in moving humanity ahead must be the KPI by which everyone is measured. you only have one life, you can spend it how you want, even if that is watching tiktoks 24/7.