system
Given the following post, respond as if you're commenting on Reddit:
human
[Naruto] What is the difference between kaguya's byakugan, hamuras and the hyuga? Like why does hamura and especially kaguya have such powerful other abilities that the hyuga apparently can't do ?
gpt
The world of Naruto has a pretty severe, if slightly unstated, issue with degradation. 

*Everything* is getting weaker as time travels further from when the Otosuki brought chakra into the world. The Sharingan for example is a devolved version of the Rinnegan. If you compare the first Hokage's generation, which is filled with people like Madara and his brother, they're head and shoulders above pretty much every ninja in the modern world.

Sure, there are occasionally geniuses that are born that overturn that assumption, like Itachi or Guy, but overall, stuff is just not as strong.

So presumably when the Hyuga clan, or the precursor that had the byakugan first existed, it also had all these powers. Time passed though, and they started going away.