There's a question of cost. Maybe you can be on time for a flight once in a while, but it costs you so much X (time, mental energy, money, whatever) that the same strategies would not help in day-to-day schedules. Ask someone with DSPS, for example.

You completely misunderstand how executive functioning deficiency works, it appears. While this was written by a person with chronic pain issues (you might not be aware of!), it applies to many other (often also invisible) disabilities: https://butyoudontlooksick.com/articles/written-by-christine....

"Just leave earlier" is about as useful an advice as "grow a new hand."

I have never ever met such a person- what does that say about the probability?

Personally I think the probability of this used as an excuse is much higher than of it beeing true.

> I have never ever met such a person- what does that say about the probability?

You did. You probably have family like that. The fact that you _think_ you never met such a person says a lot about you, though.

You haven't met really time-impaired people if you don't think they'd miss flights and many other things they "actually care".