These people apparently had the time and inclination to learn a bunch of shit about IPv4, though.

"Easy" is meant in that context. The people acting like the IPv4 version is easy.

So your second paragraph doesn't fit the situation at all.

"The shit about IPv4" was easy to learn and well documented and supported.

"The shit about IPv6" is a mess of approaches that even the biggest fanboys can't agree on and are even less available on equipment used by people in prod.

IPv6 has failed wide adoption in 30 decades, calling it "easy" is outright denying the reality and shows the utter dumb obliviousness of people trying to push it and failing to realize where the issues are.