Because there’s no such thing as private address spaces in IPv6.
If your ISP is IPv6 only, then you need to enable IPv6 for your local network too, which means that every device on your network gets an IPv6 address.
You can still have a private IPv4 as well, but if your remove the IPv6 support, then you lose access too the Internet.
A lot of the world, especially Africa and south America, was somewhat later in adopting the Internet and has a much smaller supply of IPv4 addresses. People with ISPs there need IPv6 to be directly connectable without CGNAT
To expand on this, we have functionally ran out of IPv4 addresses. Meaning IPv6 addresses are required.
Not only that, but ipv6 makes networking easier and less complicated. No longer, needing port forwarding or NAT, amongst other improvements
No shit.
But a private Lan will never need it.
There are 4 billion+ possible IP v4 addresses, nearly 600 million in the current private range.
Show me a private network with 600 million devices.
There’s no reason a device that doesn’t have a direct internet connection needs IP6.
PXE, or network boot. It is basically never used (and rarely enabled, if ever, by default) by the individual, but can be helpful in, for example, a large scale OS deployment. Say IT has to get their corporate image version of Windows 10/11 installed on 30 new laptops. They could write a ton of flash drives, but it’d be easier to just host a PXE boot server and every laptop just listen to them.
V6 specifically in that instance would just be for the reason of “we need to move away from v4 anyways”
