Speaking as someone who definitely, definitely has rather severe hyperactive type ADHD complete with anxiety comorbidity and tactile defensiveness that presents sufficiently severely to look like mild ARFID and was diagnosed over a decade ago in early adulthood:

How, just -how-, could anyone want this disorder? It's miserable, it's embarrassing to constantly blurt things out and to immediately regret it and yet not be able to change the behavior, it fucked up my educational experience (I wasn't diagnosed until AFTER that happened), every day is a struggle with it, and because of the stigma it has, I can't even communicate to people effectively what it means that I have it!

So who cares? I care! It hurts ME when people self diagnose or claim to have my disorder when they don't. It's a struggle every. Single. Day. And thanks to people apparently deciding it's cool to pretend to have, a lot of people don't even believe my disorder exists

Endlessly frustrating.