It's intended to be the opposite with fewer IPv6 prefixes needed, compared to the level of fragmentation for global IPv4 deployments combining many smaller pref

It's intended to be the opposite with fewer IPv6 prefixes needed, compared to the level of fragmentation for global IPv4 deployments combining many smaller prefixes to scavenge enough address space. IPv4 930k -> 515k aggregated https://www.cidr-report.org/as2.0/ https://www.cidr-report.org/as2.0/ IPv6 161k -> 86k aggregated https://www.cidr-report.org/v6/as2.0/ https://www.cidr-report.org/v6/as2.0/ Both of those are nothing compared to the requirements for CGNAT, tracking each individual TCP session.