I agree it's not realistic. The backwards arrow, however (i.e. you can get the real name from the handle easily, but you can't get the handle from the real name, or at least not easily) isn't hard to achieve and affords most of the protection.

If you're not going to be awful online, nobody will try to figure out who you are from a pseudonymous handle. But your employer/potential employer will certainly google your name.

Depends who you are protecting against - I think both directions require more opsec than the average internet user is going to manage.