Most of them also don't invent BS stories about being burned out or wanting to retire as the factors in why they left and then all of sudden are acting like their former selves, fired up, determined, energized and filled up with gusto and boundless energy and creativity.
Payton might've been "burned out" but it was from being Saints HC, not NFL football, in general. But, as a public sports figure, saying that so bluntly and matter-of-factly would be insulting, and smart-alleky to most of the fanbase who stood by you for so many years, so Payton decided to subtly insult or belittle our intelligences by saying he was burnt out and tired.
We now know he was far from being burnt out and tired. It was sort of the lack of honesty, and transparency that bothered me. When Mora left the way he did and quit midseason in 1996, he wasnt lying or telling a convenient cover story, he really was forking burned out.