IPv6 does not "coexist", it exists besides and outside of IPv4. It doesn't do IPv4 at all. And if we're going to switch to it, it needs to be a drop-in replacement which handles both, instead of an abstracted parallel universe where we struggle to find out what our address (or block) is, or to understand if our firewall is actually protecting us, let alone be able to choose which static IPv6 addresses we want our home web server to use.
Hurrah for everyone who found it "simple" to migrate to IPv6. Now kindly share your tutorials rather than sniffing at us old dinosaurs.