> In almost ALL context IPv6 is seen as optional, additional, additional configuration and is NEVER the default.

Weird. The past two ISPs I've had (Comcast and Monkeybrains) both had IPv6 enabled by default. I've looked at a bunch of SOHO networking gear and IPv6 is on by default. On every Linux and Windows system I've touched in the past ten, fifteen years you have to go significantly out of your way to disable IPv6.

> Some programs do not handle IPv6 at all. Game servers for instance, do not support it...

Depends on the game server. Many I run absolutely do.

Your complaints smell like you tried to run an IPv6-only client network, which would be an absolute nightmare. That's just a stupid thing for a SOHO network (and the networks that serve most corporate client hosts) to do. IPv4-only Internet hosts exist, so it's a no-brainer to provide IPv4 connectivity to clients.

On the other hand, running IPv6-only infrastructure networks can make a ton of sense. One very large such operator is Comcast, a US ISP.