I have been running a dual stack IPv4 and IPv6 stack on my home network. I run IPv4 for the windows machines and IPv6 for my Linux Mint boxes. I have been set up this way for over two years now.
I constantly have problems with the windows machines. I hardly ever have a problem with the Linux boxes.
Some people really like them. Fine, they can have mine.
IPv4 works fine on my local network, and behind a NAT I don't care.
If my survivors put an IPv6 enabled IoT device on my tombstone, that's their business.