It looks simpler to start with.. Aka PnP.. you just plugin in stuff, SLAC and later ND discovery kicks in and vioala, we have network up and running. But somehow I see it less managable and controlable. In Enterprise networks this is a serious issue. We need static IP, we need well known subnets, because we run FWs everywhere.

And yeah.. soft LL in IPv4 is good idea. You can use it. In IPv6 you are forced to use it. Oh thank you, OSPFv3 configuration is so cool on in IPv6..