My admittedly cynical view, then, is that the structure has outgrown it's usefulness. Features are being added, which enable phone number spoofing and other sh

My admittedly cynical view, then, is that the structure has outgrown it's usefulness. Features are being added, which enable phone number spoofing and other shenanigans, at some point deep in the network, such that common carriers, at the tips of the network, have no control over. Thus creating a scammers/spammers paradise.