It comes down to the specious case of being able to do cross realm grouping, which as far as I know requires RealID. Or does the new community system make even that obsolete?

Never was a fan of Real ID.... I call RL friends by their game name IRL. And, yeah, my bnet accounts are separated, so it was my own name showing. (And I just tried setting up SMS Protect.... where they limit you to using one phone per account. Now I apparently need 5 more phones.)