User blog comment:DazzlingEmerald/The Hyuga/Ōtsutsuki Bandwagons Are Coming..!/@comment-6003865-20141031232952/@comment-28861328-20141101054906

It isn't severely underestimated. Like I said, Kaguya is the pinnacle of power in this universe. She is at the top. Even she relied more heavily upon her Rinnesharingan than the Byakugan because the Byakugan is far more of a passive ability than the offensive nature of the Rinnegan/Sharingan. Kishi just didn't make the Byakugan that strong. It just isn't. Doesn't mean it isn't useful, but if you put two even leveled shinobi, one with Sharingan, and one with Byakugan, up against one another: Sharingan wins.

So you can see all around you? Well, I can see every move you make before you make it. Oh, you killed me? Izanagi, bitch (yes, I'm aware of the blindness). Your eyes can see me more clearly? Good, then you wouldn't mind falling under my genjutsu (the enhanced sight actually makes it easier for Sharingan to cast genjutsu on the Byakugan). That's a nifty trick there. I'll just copy that for later.