Truth be told, IPv6 still doesn't work. I've stayed in plenty of hotels and plenty of airport Wi-Fi that only had IPv4 routing. Until it's universal, it can't be considered a solution.
https://teamarin.net/2019/04/03/microsoft-works-toward-ipv6-...
But AFAIK that is still aspirational. I would be pleasantly shocked and impressed if they had already achieved that.
Things change...