Because from that description, it sounds like it would probably be a fringe thing, but I don't know the field in the slightest, so I can't be confident in that.
Also, that description at the end of the post, that you say it explains, doesn't seem to match my experience.
Also, I don't think I see how it relates to the parent comment?
There's some evidence that the left and right brain hemispheres have their own desires and goals, based on some studies conducted by Roger Perry in the 1960's. Sperry received the 1981 Nobel Prize in Physiology or Medicine for his split-brain research.
https://embryo.asu.edu/pages/roger-sperrys-split-brain-exper...
Aside from the left-right split, I think there's a large category of well-supported models that conceive of the mind-brain as modular, but with sub-units dedicated to basic processing tasks (memory retrieval, sensory integration, etc.) rather than being fully-formed, discrete "personalities" in themselves.
It’s why you could seemingly be one personality when you encounter love, hungry, horny, etc and seemingly different person while in a different context.
https://youtu.be/LuJLv98ks-I