Part of the problem is older consumer networking equipment. Comcast has supported IPv6 for quite a while, but many routers I've used are not configured correctl

Part of the problem is older consumer networking equipment. Comcast has supported IPv6 for quite a while, but many routers I've used are not configured correctly out of the box to work with Comcast's IPv6 implementation. Even getting IPv6 to work with my new UniFi equipment took changing a setting or two away from the defaults, though that is more expected with prosumer and enterprise gear. I bet there are lots of customers with 10 year old gigabit routers that have had no reason to be replaced, and will still be perfectly serviceable for another 10 years, especially if they use a separate wireless access point. Many of these people probably don't even know what any of this means.