If you’re scared of people finding out what your account name to a video game you play, then you should probably stay off the internet honestly.
OH NO!! PEOPLE REALIZE THAT THE CHARACTER BEHIND BARIDORIELOR IS BARIDORIELOR#1763!!! OH MAI GAWD GUYS! THEY KNOW MY ACCOUNT NAME!!! AAAAAAAHH!!! AAAAAAAAAHHHHH!!! AAAAAAAAAAH!! 
/s
See, i can overreact over nothing too.
Because it disallows toon hopping and seeing the b-tag will stop that. I mean Plunderstorm is already doing that, so it showing here as well in WoW wouldn’t make a difference at this stage.
That and Anti-Btaggers want to justify doing terrible things to people, and instead of taking responsibility for their own actions and not victimize themselves, they would rather hide.
Imagine if somebody actually doxes (Not just looked at you at a public website and clicked print screen on your account name of a pixel game, i mean you’re actual personal information about you) you and switch to another character. By their defense, they are justifying their actions, and so much worse still.