Global registration is more about "a way to orchestrate who's allowed to send data to the ff00::1234 group" than "I hope we don't accidentally overlap!". It's t

Global registration is more about "a way to orchestrate who's allowed to send data to the ff00::1234 group" than "I hope we don't accidentally overlap!". It's the same reason we assign IPv6 unicast space to entities even though random generation could work almost all of the time.