> My domain registration is just over 25 years old... I guess I'm also "legacy"?
Mine too -- I mean, I had domains in 1994-1995.
Most people who have legacy AOL emails have them from more than 25 years ago-- indeed AOL was in decline by 2000.
And "protip: go back in time 30 years ago and tell your kid self how to get a domain name, and navigate internic's overcharging" isn't quite as practical to implement.
A lot of these old services used the email address as the fixed user identifier making it much less likely (certainly for those bucket of services) that he'd have a user-facing option of changing it.
I don't think I'm missing any point, thanks.