I wonder how many people think that if they're called "John Smith" that Google will a) just make the email for them and b) that they're the only John Smith around the town/state/country

And even if you validate, what'll most likely happen is that people will still type the wrong email then get angry the system didn't guess their correct email

sigh

At least my name is pretty rare, but I've occasionally gotten emails to some with the same first name (think company LDAP email completion)