As per the other question, you're trying to blend together two separate theories into one - then asking "why?"
Going back to my own energetics of the nervous system, it strikes me that both DynAss and DynAgg are "expensive" organisms, in pure energy expenditure.
I suspect most others cannot live all the time with this intensity or uncertainty/ Indeed, uncertainty is far more expensive than beliefs and even control-freaks.
So... we are probably outliers - outsiders even.
Whether that is closer to the truth or further away (lol) is a moot point.
I remain unconvinced about the "life is for learning" trope - I mean, that still doesn't answer "why?"
One possibility is that the different levels, and their energies, interact with each other - not just in one direction - so that the increased power may need the physical in order to charge itself.
eg a battery does not actually store electricity inside it - it stores the potential for reactions that then create the electricity.
Yes, I am asking too many questions which should be divided. The thing is, I have practically zero data to help even approach those questions after 22 years. But you seem to have a good sense of what this theory entails.
Excellent observation, but these two Energies are also incredible generators of energy, so what they spend they quickly regenerate. Adaptive Aggressives also expend a lot of energy, but they consume it from others, along with what they naturally generate.
Dynamic Assertives... absolutely... outliers and outsiders.