The article does cover it, but a bit later: It talks about e.g. WiFi lightbulbs and the like, still running on IPv4, and covers Postel's Law pretty well, consid

The article does cover it, but a bit later: It talks about e.g. WiFi lightbulbs and the like, still running on IPv4, and covers Postel's Law pretty well, considering it not 'a good idea' so much as 'you may not like the law of gravity, but the law does not care'. Postel's law is not a principle you should apply. Postel's law is a thing that will be done to you, regardless of what you think of Postel's Law. In other words, some numbnut with an old wifi lightbulb is going to write some cruft to attempt to make their IPv6 only router somehow route their stuff to IPv4. Whichever clowny moron sells a router that actually enables this numbnut wins the fight, because said numbnut will buy the clown's product. I'm just rephrasing and repeating that article as I understand it. Point is: Yes, the bout of pessimism is covered. And covered again, and in a better way, in the followup article linked at the very end: It's the application of the notion that Postel's Law is a force of nature and not an applied principle.