I had to physically go out and locate someone in the game world just to blacklist them (they hadn't spoken ingame around me, but for out of game reasons I didn't want to speak to or hear from them), and I don't think I should have to point out why that is a really, really sad state of affairs, and incredibly questionable besides. Necessitating going and snooping on someone so that I can blacklist them is ridiculous. There are a few people who sporadically will bother me around expac launches, and I'd like to be able to preemptively stop that from happening when I make an alt, but nope, not possible now, I have to counter-stalk just so I don't get stalked.