@SimonWoods @vincent I was thinking the same thing! Apple is going to ship this before we get to juggling multiple accounts on the web, although we want to do it eventually.
@manton @vincent Yep, makes sense. It's good that, in the meantime, you can point people to the Profile work-around.
As much as some of us old web nerds would prefer a world with a variety of thriving browser engines, I think it's more than safe to say that everybody else just doesn't care. So it's great to see Safari getting so much better.