IPv6 is "on" for _all_ places we could enable it at the flick of a button. ALL of them, bar none.
... like our image hosting domain, regmedia.co.uk
All images you load, or all assets you request from that domain, are likely to be served over IPv6 if that's your preferred method of connecting to the interwebz.
Not all hope is lost - it's "only" the main content site that lacks IPv6.
with absolutely no public explanation
Seriously? No public explanation? Look at my comment history, and look for "IPv6".
https://forums.theregister.co.uk/forum/containing/3687246 - 4th Jan 2019
https://forums.theregister.co.uk/forum/containing/3579103 - 1st August 2018
https://forums.theregister.co.uk/forum/containing/3536352 - 7th June 2018
https://forums.theregister.co.uk/forum/containing/3521098 - 22nd May 2018
It comes up in every IPv6-related thread, and usually in the same condescending manner (not your case!): "my phone has IPv6 only!" "my car has IPv6, why can't you" and whatever else.
My/our reasons are still the same. We're a small team; we have other priorities; the business has other priorities; my own business ISP still doesn't give me proper IPv6 connectivity; I have to use he.net's IPv6 tunnel; bits and bobs in our system (database fields, some validator, other bits and bobs) still can't deal with IPv6.
All those reasons are still the case, and will continue to be the case until the situation or the priorities change.
The very moment I'll be sure that the systems can deal with it, it'll likely be the most happy I've ever been at flicking a deploy button, and I look a LOT forward to being able to do that ;)