I've heard and met many - its just hearsay to me. Fools believe hearsay. Until there's some advanced blood test or biological marker, the diagnosis is complex social engineering or at best, pseudoscience.
I struggled with many of these things -- primarily time blindness, executive function and impulsiveness -- for most of my almost six decade life, and finally understanding what was happening -- and getting help for it -- has been life-changing.
As one friend put it, he would cut off his left testicle if it meant having working executive function. The idea that I -- and friends and acquaintances who share similar experiences -- are faking it is ignorant and insulting. That you do not suffer is a gift; be grateful. Maybe don't be so dismissive of the struggles and suffering of others.
[1] https://www.youtube.com/playlist?list=PLh4RKnr7ygXsO1ImoyB0K...
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2894421/ https://news.mit.edu/2014/inside-adult-adhd-brain-0610