You clearly do not understand networking. Or else you won't make such a statement:

>This is stuff that could be implemented in any ipv4 stack in some days of work.

The sysadmins across the world, who had to deal with decades-old, never-updated devices facepalmed in unison.

At least the other comment agreed that "IPv4+" hosts will never be able to talk to IPv4 hosts.

>IPv6 is overengineered, thats the reason why it's not adopted after 30 years.

It is already adopted in many countries. Don't blame the protocol for your countrymen's incompetence.