It would be interesting if by absorbing other superhumans you would get one of their abilities or get one step closer to evolution by incorporating some of their super genes to yours, reinforcing your existing abilities or triggering new ones earlier(I'm saying hypothetically because I didn't get a choice to absorb Klaus/automatically absorb him and I'm not sure if when killing Danica you absorb her and get a stats boost or whatever)
But it could also give a balancing issue of the MC being too OP and broken, so I get the why it probably ain't happening
Alice automaticaly stops you from absorbing Klaus no matter what you do.
And I do believe how many Superhumans you absorb is a stat that will be ''hidden'', and will likely only count towards the end and what ends up happening to the Mc.
Take Danica for example, if you try to consume her ( actualy I remember the Mc's tentacles try to consume her without his consent ), I believe the Mc notices her powers are at a greater level and he purges them before only absorbing her memories in order to not risk damaging his own consciousness.
So given how that goes you'd believe that was a failure, however, when you reach the next evolution, should you tell the Eye that your ultimate goal is power, he will tell you to not miss the chances of consuming several people, among them he says '' The Crossed Assassin '', which most likely refers to Danica.
So again, consuming people and primarily other Superhumans gives I believe an increase in power and ofc corruption as a immediate reward, and will likely be a key factor towards the very late game.