[ryanianian]

So did Google? Not trying to be trite here, but that's essentially exactly the point. They didn't want to let a sketchy charger brick the phone, so they disallowed sketchy chargers.

You could say that the phone should try to accept any charge and never break, but that's a nontrivial amount of electrical-engineering and expense involved in accepting basically any wattage/voltage that a sketchy charger may produce.