I permit IPv6 SSH into my home network precisely because I have a static V6 delegation and can do it, where my IPv4 binding is necessarily mutable because of the use of CGN, and lack of pool addresses. If I want to "phone home" then this is simpler than managing dynamic-DNS to find where my home is right now on v4.

Above the IP layer, TCP/UDP rules should be underlying AFI agnostic. But I can believe the firewall DSL don't make that easier.