I have similar thoughts about all the accounts, but they all have a purpose. LJ is for interacting with fandom friends. Dreamwidth is my backup for that, even though I know not everyone is on it. DeviantArt is for hosting my images because I can't figure out how to get Box to do it without it being ugly, and to let me in on the art resources like stock images and tutorials. And my hope is that AO3 will become my legacy, such as it is, and a better way for me to keep track of the fic I enjoy. I cannot, in all good conscience, get a twitter or tumblr. What I already have eats up enough of my time as it is!

What exactly defines a BNF anyhow? Why would an artist never achieve it? I happen to agree with your statement about it being a dubious distinction. Not wanting to de-anon shouldn't be an impediment though; in the online world of fandom a handle is as good a name as a given one, and physical location is largely irrelevant. I can say with surety that I have not achieved BN-Anything status, I have nowhere near enough comments/kudos/faves to have done so. And that's OK!