Still and issue and it's 2017!!!!
While I could easily use my registrars free dns hosting to support ipv6 (i checked they do (because it's 2017)), I'd then be at the mercy of dreamhost changing ip4 address without knowing (which has happened before).
If Dreamhost went to the trouble many years ago to allow hosted accounts to add ipv6 addresses, including shared hosted accounts, why not add ipv6 ip addresses to their own nameservers? I don't get it.