the main problem is the common scenario when you no longer have access to the e-mail account, and i know there's also a quote about that
though "Email recovery...[is] the only way I can identify you" is pretty related in that sense, if you can't somehow prove you own the key he can't help you, and the associated e-mail is p much the only sure-fire thing
if you have access to the e-mail account associated with the key then the standard e-mail recovery is obv the best option because it'll actually work lol