It is, though. At least e-girls draw heavily from the 00's emo and scene girls with more weeb vibes thrown in, but there's a clear influence.
>Millennial cut would be emo fringe for mid 00s
>Or the hipster undercut for early 10s
The emo fringe, outside of the scene, was shortlived and not that widespread. I'd say the undercut is the quintessential millenial haircut, which is sitll sported by older millenials nowadays (now with a short beard to match).