As I said, I'm not that good with faces, so mild face-blindness is obviously a common feature in real life as well.
I can shoot deadly fumes out of my ass. But, then again, I usually just rob banks, so I'm not a hero.
... with facial recognition technology these days, the villians could use that to figure out the "alter ego" and ruin their life without ever confronting them. I mean things like stealing the alter-ego ID, ruining their credit, making it impossible for them to get a job, get a felony record, etc, etc.
"Hey, girl, you got new glasses!" "Hey, dude, you got new glasses, what's with the suit? Are you in process of turning into Supahman?"
EDIT: When Clark Kent goes into a phonebox to change, where the hell does he store his suit, shirt and tie? They would get stolen in five minutes. He is probably paying a zilliard for new outfits each bloody year.
Put him online, then.
He is in a lot better mental health than I am.
Most of the people - myself included in that bunch - are somewhat weird.