It's a parallel argument, but it's not a good one, because IPv6 is now around ~50% of traffic depending on the service and details, and DNSSEC was introduced ea

It's a parallel argument, but it's not a good one, because IPv6 is now around ~50% of traffic depending on the service and details, and DNSSEC was introduced earlier and doesn't seem to be going anywhere. IPv6 probably could have been done better and rolled out faster, and whoever works on IPvNEXT should study what went wrong, but eventually it became better than alternative ways of dealing with a lack of IPv4 addresses, and it started getting real deployment.