Comment by YouKnowBetter

From a corporate perspective: we are just scared shitless to implement v6 internally.

Keeping (private) v4 working is hard enough.

Even drafting a project budget for v6 makes management go balistic. - firewall & IDS upgrades

- firewalls rules

- accountablity

- dynamic DNS

- employee education

- toolchain updates

- upgrades of software

- functionality tests

Not all companies employ NY or Google level engineers who "just roll out v6" on a Sunday afternoon.