[WorldMaker]

As far as we can tell from aggregate statistics, consumer devices have been leading IPv6 adoption, not lagging it.

Charts of IPv6 usage such as Google's tend to still show a strong "bathtub curve" with a very noticeable decline during 9-5 work hours making a pretty clear case that corporate/enterprise devices are the ones (greatly) lagging behind.

Consumer devices most directly feel the effects of NAT/CGNAT and feel much more pressured to route around that IPv4 "damage" with IPv6. Some consumer networks, especially mobile carriers in every part of the world, have moved to IPv6-predominant (if not "IPv6-only"; depending on how you feel about IPv6 to IPv4 gateways). The "Happy Eyeballs" algorithm has been in play on most Consumer OSes for several years now and consumer devices generally strongly prefer IPv6 services over IPv4 when given a dual-stack choice.

[kevin_thibedeau]

There are a ton of IP connected devices that aren't running a sophisticated OS. IPv6 may not be available or, even if it is, the codebase is fossilized around handling and storing IPv4 addresses.

[kstrauser]

BTW, the new Thread stack for controlling IoT stuff in your house is IPv6-only. That is, my light bulbs now run on IPv6.