Are there oneway passports?
After Calif started handing out driver licenses to illegals, they quickly depreciated as a form of valid ID. It didn't take long for the Feds to disallow Calif and other states who had didn't have firm control over the ID process. The net result was that the Feds implemented a "Real ID" system based on passport credentials, which means the std CA DL can't be used for travel/fed ID purposes. However, if you bring all your proper docs, CA has a second type of DL (that simply mirrors the old DL ID requirements) that satisfies fed ID requirements.
Point of all this? The funky birth certs issued by states like CA, NY et al are all fine & dandy for intra-state purposes; each to his own. But what happens when it comes time to apply for a passport or any other form of Fed ID requirements, such as a security clearance? Can we say medical exam to render a definitive M/F decision?
So, imagine this scenario: person A, who comes from a normal state/family, sails through the prelim ID requirements. However, person B, who unfortunately had freaks for parents, now has to schedule a medical exam just to qualify for round 1 of a normal Fed ID process. Think they'll be thanking their parents?