Removing constraints can make a task much more frustrating because the resulting solution space may be too large for humans to navigate.

“If we make them very simple, it's easier to control the complexity, similar as it is in art. And it can be exciting to work with constraints, and if you remove the constraints, the task becomes much more frustrating because you would have to suddenly, uh, to conquer an enormously large space, and the space might be simply too large for human beings.”