Good points.everyone has chakra. it is considered lifeforce in most lore anyways.
But sticking to NV, Kaguya and her people are known to possess the KG byakugan.
From what we can speculate with the interactions between Momoshiki and Kinshiki, they have the ability to consume other people's chakra.
Before Kinishiki sacrificed himself, he gave us a hint that his mentor also gave himself by turning into a chakra fruit.
Animals and the tree you could say have plenty of chakra as they are one with nature, senjutsu, to the point they are overflowing with it and they can actually use some of it for ninjutsu.
So my speculation is that since humans are so detached from nature and dependent on technology, they can no longer naturally accumulate more chakra. They are then stuck with their own chakra and any attempt of using manipulation on their own chakra can result to death or falling ill. So they simply just stuck to their tools.
In Kaguya's planet, since they can absorb other people's life essence/chakra, there must have been battles and wars to consume one another so that they can grow stronger. We can see this happening in the Uchiha clan in which they murder others for each their's eyes to get stronger and more powerful. The same with Hyuga clan having their eyes stolen, hence the seal.
I assume that is why Kaguya fled. I believe that she started out as a benevolent being and was looking for a way to stop the war in her home planet. Then she found her solution but she found the same problem occurring on Earth and the rest became history.
true, they are born with it, no dispute. but you are wrong about the Tenseigan/Rinnegan theory. They get Tenseigan when an Otsutsuki implants a Hyuga Byakugan, it bonds with their Otsutsuki chakra and evolves into Tenseigan
It's strange how that works considering the Hyuga descend from them. If anything taking each others eyes should give them the Tenseigan like Uchihas' with MS taking their siblings eyes awaken the EMS.
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