[yjftsjthsd-h]

> Good IPv6 host support has been a thing in almost all consumer OSes for over 10 years now. All currently supported versions of Windows, MacOS, Android[1][2] and iOS support IPv6 natively.

You probably need to care about the last couple unsupported versions, too; 5-year-old Android versions are still in the wild. Thankfully, it's a rolling window and the stuff with poor support is dropping off.

> The problem is simply that some people don’t want to spend a couple weekends to learn a new technology (one that is old enough to purchase alcohol in all 50 states—-this is not like chasing the latest web framework).

The problem, speaking as someone who spent some weekends worth of time on it, is that the technology, which has only been relevant for the last handful of years regardless of when it was first released, is not nearly that simple and works just differently enough to trip you up. (And you can't just do a full replacement and drop v4, so the differences will keep tripping you up)