I don't believe it's weird, in fact, I think it's natural. IPv4 is better (because every single machine and server has IPv4 connectivity, unlike IPv6) and available addresses are getting scarce. Therefore, IPv4 access with no CG-NAT is turning into a "premium" service.
All new contracts are ipv6 and the only way to get to ipv4 is via customer support. However right now ipv4 gives you the better experience.