Honestly, I think that it is _the_ reason. IPv6 is a terrible protocol, but it could have worked. The problem was that the early IPv6 migration strategies all

Honestly, I think that it is _the_ reason. IPv6 is a terrible protocol, but it could have worked. The problem was that the early IPv6 migration strategies all focused on getting IPv6 connectivity to clients as fast as possible (like 6to4). And once you got that IPv6, a lot of stuff just stopped working. It became all-or-nothing, and the option to just disable IPv6 and fix all the issues has always been there. Happy Eyeballs was standardized criminally late, in 2012. For some reason, the idea that a connection can be something tentative was not a part of the mindset at all. I'm guilty of that as much as everyone else, I remember spending a lot of time working on connection roaming for 3G/WiFi switching.