IPv6 consumer devices are a dumpster fire
ISPs and IoT makers have set the stage for huge IPv6 DDoS attacks that could take years to fix once they've started. Half of IPv6 devices have zero security and half of them are WAN hardened for peer-to-peer connectivity. Routers from ISPs make that difficult or impossible to manage. At best, they require you to create custom firewall rules for inbound IPv6. No doubt the most popular solution is going to be the wildcard-to-wildcard ALLOW rule that non-technical people can copy & paste. At worst they have one big "on/off" switch and it needs to be "on" anyways because the firewall is buggy. This mess has been building up for years and it won't get fixed anytime soon.