> Also, notice how Android and iOS don't support turning off IPv4.
You can trivially connect an iOS device via IPv6 only.
Presumably thats with the network having a PLAT somewhere if you’re relying on CLAT for any v4-only connections when you use safari
Can you share details on how one trivially connects via IPv6 only? I see no option in iOS Wi-Fi settings to do this, and I think it's reasonable to expect not to have to turn off IPv4 on my access point to test IPv6-only networking.