All ipv6 shortcomings discussion aside; What I think is the more vital problem to focus on is that the governments clearly don't want us mere mortals to expose our own servers running on our own hardware to the outside world (most often justifying that with "it's for your own security" mantra, for we're all deemed too dumb to figure that out for ourselves). ISP-imposed ipv4 double NAT (imposed on ISPs by the governme…
CGNAT isn't imposed by governments, it's imposed by address space exhaustion in v4. v6 fixes it by having enough address space that NAT isn't needed. Governments share some responsibility here for not mandating a move to v6, leaving everybody in "wait for other people to go first" mode, and one might ask why they've done that but the answer is mostly that governments don't usually get involved in the Internet at that…
Note that this already happens to an extent. Some ISPs try to protect their users from UPNP attacks and block certain inbound ports. On the outbound side, many ISPs ban port 25. ISPs could have easily claimed security and limit inbound connections far more - but the reasons for these limits are apparently money+security and not a secret government mandate, so they didn't limit everything.