Disagree. APINIC got screwed on the IP allocation side, they're the RIR with the largest population but they have a tiny amount of IPs compared to ARIN. India and China have billions of people and not enough v4 space for them. If we go back and reallocate legacy blocks maybe you could make the system work but that would be a big fight with the legacy networks.

v6 restores the end-to-end principle and reduces network complexity once you go v6 only. Not more NAT traversal problems, no need to deal with STUN/TURN, small networks get even simpler with no need for a statefull DHCP server.

Sticking with only v4 space also artificially increases the cost of starting new networks and services because you have to buy space from the entrench IP save owners (unless we change the rules are start charging fees to legacy networks and reclaiming unused or poorly utilized space). Those higher barriers to entry hurt innovation and competition.

So v6 solves several technical and policies issues with the Internet, and maybe that's why we haven't seen speedy adoption. Because people have networks that exist today, some have paid a lot of money for IPv4 space and they want to make the most of that investment.

They don't really have an incentive to implement V6 unless things start to break without it.

I don't think v6 has been a failure half of all internet traffic runs on it! It powers the major cell phone networks, and large tech companies like meta have even gone v6 only in their data centers.