This article was of some value to me, but I too have some questions
I do not know a lot about IPV6 and this article did teach me a few things, such as why some addresses have ::: in them with no values between the colons, but I am not sure all the examples are valid.
On #4 does FE80:CD00:0000:0000:0000:0000:211E:729C really translate to FE80:CD00::211E:729C? Shouldn't it be FE80:CD00::::211E:729C?
And on #10, the author discusses colons but does not show a colon in the example.
I think a tech editor should have reviewed this article, but items #2, #3, and #5 were of value to me. Thanks to the author for those.
My opinion about the adoption of IPv6 is that it is neither slow nor fast. I think the delay is just that it is not a high-priority project for businesses to take the time to do it. What pressing business problem does it solve? In most cases, none. Yes, I push for it myself, but it is not as important, right now, as many other projects facing us.