You seem to be failing at reading comprehension here. As has been repeated a couple of times, but once again in all caps for emphasis: SOME PEOPLE WANT TO USE

You seem to be failing at reading comprehension here. As has been repeated a couple of times, but once again in all caps for emphasis: SOME PEOPLE WANT TO USE NAT TO OBSCURE DEVICES ON THEIR NETWORK. Period. End of story. That IPv6 makes nat 'useless' is not a point in its favour or a benefit. That IPv6 NAT is inferior to IPv4 NAT makes IPv4 preferable and IPv6 something to be avoided for people who have this particular use case.