Dont hold Europe up like a shining beacon..

It's a coin toss on if BT will properly allow ipv6 traffic each time the router reboots.

I've had to make provisions to force ipv4 on my machines because although composer et al. runs fine on my vps and elsewhere, if it tries to access it via ipv6 at home it more often than not hangs indefinitely.

"In Europe"? Europe is made of many countries and all ISPs have a national structure (even if they operate in several countries) and they all decide to roll out or not ipv6 independently.

I'm in Europe, I have yet to have used a residential (or even corporate!) network which has any form of IPv6 support. Of all the networks I've interacted with over the years, only my cell carrier supports IPv6.

Comcast Business requires customers to use a gateway provided by Comcast to support static IP addresses. I was thrilled to finally get IPv6 support, but it seemed impossible to prevent Comcast from inserting their own nameserver in IPv6 leases, which broke my network. I tried running my own dhcpdv6 and radvd servers to no avail. This took me way out of my comfort zone and much deeper into the weeds of IPv6 than I ever expected to go. I finally disabled IPv6 (and I can't even tell you how I did it) to get things working properly again. Maybe I don't have the required skillset to implement IPv6 properly, but I really got the feeling that Comcast introduces unnecessary obstacles for business customers with slightly advanced needs in order to serve the lowest common denominator (aside from my special requirements, IPv6 mostly worked out of the box, which is probably their goal).

Yeah, that has been typically the case a few years ago around here - you could have more than a single /64 on a residential connection (and better than the bare minimum of other IPv6 functionality), but it required to get your own router (and sometimes even spend time with tech support because they wouldn't test that use case as much as their own router that you'd get by default).