alt Hacker NewsIPv6 invalidated the existing IPv4 addresses, changed the addressing scheme, and de facto got rid of DHCP and NAT in favor of SLAAC and global routing. It doesn't share any state with v4. This was a very different set of choices from just adding more bits to v4.
Nobody's stopping you from using DHCP and NAT on IPv6, it's just not the norm.
The protocol itself is literally very similar to IPv4. They got rid of the IP header's checksum, but I don't think that's something you're complaining about, right? They renamed Time-To-Live to Hop Limit because that's what it actually does - is that a complaint you have?
What do you mean it doesn't share any state with v4?