Easy - it sucks!

I tried to failover wan on a biz network. With ipv4 NAT this just works. Local traffic doesn’t even blip. IPv6 is comically bad here. All the autoconfig magic falls on its face. I don’t want rotating ipv6 addresses everywhere. Things like nptv6 as a workaround badly supported. NAT66 etc results in comically large internal address space - the list goes on. Can we do ipv5? Ohh, and my isps won’t give out static ipv6 blocks to save address space but a static ipv4 block is easy.