I'm working on same for my family since I want to properly degoogle a bit. One thing I think long term - if I give my kids first-name @ last name , that means that I forever hold power over their email. Which isn't great. But what's the alternative? Register one full domain name per kid? Even ignoring the cost, the ergonomics are awful.
Imho email is missing a feature for nameless email addresses for when somebody just buys their full name as a domain name. If I get "firstname-lastname.name", having the email be "[email protected]' kinda ruins it.
From what I can tell most people do something like [email protected] or hi@domain.
Not to mention some of those kids may end up changing their names at some point if they get married and decide to take their partner’s last name.
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A child born today sees email like we see the telegraph...
they'll grumpily sign up to gmail just so they can get a verification email, and that'll be all it gets used for. Messaging their irl friends will be done in apps like Discord.