An account on a website is more like a loyalty card than a driver’s license. And I just checked… I have 34 pieces of “ID” like that in my wallet and on my keychain. No, 36, I forgot the access cards around my neck.
I don’t want a single ID. I have multiple IDs. It’s none of your business what MMOs I play, and I have no interest in sharing just how geeky I am with random high level druids on some game, so googling for my RPG character won’t pull up messages posted with my real name, and vice versa. And if I have to carry two “loyalty cards” to make sure of that, that’s fine.