They teach us how to get better.
They show us where we are vulnerable. They challenge our assumptions, reveal gaps in our research, and, if we are wise, unite us in a drive to achieve.
They demonstrate new approaches that we can avoid, adopt or improve. They remind us that while we may be wise, we do not have a monopoly on wisdom and there may indeed be areas in which we are barely sufficient.
In some respects, they are not the opposing team; they are extensions of our team.