> Extending the address space didn't need a complete rework and rethink how local network routing works, removal of standard NAT and messing around with address

> Extending the address space didn't need a complete rework and rethink how local network routing works, removal of standard NAT and messing around with address assignment (DHCPv6, SLAAC, and all of those messes). I think the issue here is that IPv6, despite being the successor to IPv4, is actually quite old in itself; it was developed starting in the early 90's and so it's just a different idea of what the internet was going to be. NAT is more like a "hack" that developed around that time as well and has turned into the normal way networks are managed.