> You can have zero configuration address discovery in a way that is simpler than IPv4.

SLAAC is great, unless you want to be able to be able to register devices ex. so you can add them to DNS, at which point it becomes a liability.

> You can have stable addresses across ISPs if you bring your own prefix or use a tunnel.

I do really like that, yes. Being able to do a VPN and not worry about colliding with other RFC 1918 users is great.

> You don’t get as easily blacklisted for email delivery since you dot. Share a /24 with a bunch of spammers.

Anyone doing blacklisting by IP just blacklists subnets or ASs, so I really doubt that this is better.