What is the use of being human?
There is no built-in use; humans are the species that invents its own reasons and hands them forward.
The word ‘use’ smuggles in an assumption
Asking the use of a hammer makes sense, because someone designed it for a job. Asking the use of being human assumes a designer with a job in mind. Biology offers no such brief. Evolution does not aim; it only keeps what survives.
What is actually unusual about us
If there is anything distinct about humans, it is not strength or speed but a strange recursive trick: we can model ourselves, imagine futures we will not see, and ask what we are for. No other known animal stages its own existence as a problem to solve.
Existentialist thinkers turned this into a slogan: existence precedes essence. We show up first, then build whatever essence we are going to have. The lack of a given use is not a defect. It is the space where a person becomes possible.
Meaning is built, not found
“Those who have a why to live can bear with almost any how.”
- Friedrich Nietzsche, via Viktor Frankl Frankl, a Holocaust survivor, argued meaning is not received but chosen, even in the worst conditions.
So the honest answer is mildly liberating. Being human has no use the way a wrench does. It has uses, plural, that you and the people around you keep inventing, arguing over, and handing forward. The question has no final answer, and that is precisely what keeps it human.