Thank you for writing this. It is a different way of doing it for sure, but after learning how it works, it's actually easier and better than other implementations I've seen. So again, thank you Brogan for taking the time to educate me.
This guide is still relevant for XF2 and should be required reading for new admins. Everyone's usergroups have different needs, but aside from "banned" it's hard to imagine a scenario where you wouldn't set Registered as the primary group.