Computers are usually really good at following instructions. Even when one randomizes a task or output, there is a set of possibilities that the computer will choose from. Computation does not do well at breaking rules. Fringe cases, outliers or other things beyond the rules are not dealt with.
Agency allows a human to make decisions in a moment that may be outside of the rules. Working from a sense of embodiment, social, historical and other subjective knowledge that lies beyond following the rules.
The humanist escapes computation. And this is what makes performance interesting.