The question was not about if being manipulative socially later in life is not a benefit. Of course it is a benefit.

But you get graded based on your ability to read, write, do math, memorize data points. Not on your ability to lie to your teacher in a believable manner.

You may excel later in life, but it's not like you can enter Yale because you can manipulate people.

You also need a certain level of other intelligence to properly manipulate people, or at least a certain level of self narcissism.

I mean you kind of proved my point, perhaps we should be teaching/discussing social skills.