Kishi has redeemed byakugan. Hyuga are still fodder
And Kaguya is an otsutsuki, not Hyuga
Well, considering her age... no doubt the Hyuuga clan descended from her clan many centuries ago... Odds are at least.
So in a way, she is a /sort/ of a Hyuuga, much like if your last name was Martin, and your cousin is named something else. Granted many cousins down the line...
Disregard this if inaccurate (educated guess).
Edit no jutsu:
Who knows... Maybe we'll see the So6p's brother have more eye feats than his mother... Eye-wise... (Who could have taken up starting the clan name "Hyuuga").
Edit no jutsu x2:
Idealist: "My theory is this in the beginning the Byakugan (white eye or empty eye) was the original. That was Kaguya's ORGINAL power upon getting chakra however the power of the biju turned the eye blood red like those of an enraged jinchuriki hosts eye. The empty eyes were filled with the marking of the Shinju's eye's. Because the new eye is not clear it lacks the sheer perceptive power of the original. but in turn it is filled with new powers. That is shariinegan. The rinnegan is an eye that is given to one born from one who was bonded to the shinju. Ex Hagoromo's mother Kaguya has the ocular powers of the shinju and its physical Mokuton as stated by Madara is derived from the shinju's sentient braches. Having both powers passed down to him he unlocked a water down eye. In turn the shinju's power was split between Hagoromo's sons the remaing power went into Indra's eyes filling them turning them into mirror eyes instead of emepty eyes and Ashura got the power stored into his body.
My belief is that the hyuuga never received additional power in their eyes so it remained empty.
Or dormant... One of the two.