> It's not [fucked up]. It's simple, understandable, straightforward.

Things that are fucked up can also be simple, understandable, and straightforward.

Unless you're claiming that DHCPv6 is not simple, understandable, and straightforward... in which case:

DHCPv4 is "Give me an IP address, please.". DHCPv6 is "Give me an IP address, please. And also give me what I need for all of my directly-connected friends to have one, too, if you don't mind.".