But this same issue occurs with CGNAT IPv4, whose private address delegation is even more opaque than IPv6's prefix delegation. And CGNAT will become more preva

But this same issue occurs with CGNAT IPv4, whose private address delegation is even more opaque than IPv6's prefix delegation. And CGNAT will become more prevalent going forward as address exhaustion becomes a bigger issue. There's no circumventing the fundamental problem that there is no 1-1 correspondence between IP addresses and "real" users.