> I've had less than 0.5% of customers ask for IPv6 from my fibre ISP. It's not worth supporting as a result.
Big, evil, hated Comcast has full ipv6, and I doubt any of its customers asked for it either. Instead people complain they’re only getting a /60.
Comcast was forced to go to IPv6 because they ran out of IPv4 addresses in the private address space to use for management of their network (think of how each and every cable modem needs a an address for management in addition to all the routers and CMTSes). I was a fly on the way inside one of the router vendors when this took place more than 15 years ago.