Except for the whole "run anywhere with a terminal", "high quality packages with decades of bugfixes" and "pretty much extensible in every way".
(I'm a Vim user myself, but I feel like comparing Atom to Emacs is a big... optimistic. People keep complaining about how slow Atom is, how much memory it hogs up, etc. I think it needs at least a few more years of maturation before being able to call it "the Emacs of X")