I don't think it's been co-opted? Mirroring the emotions of another person you're actively observing doesn't give you insight into why they're feeling that way. It's just mirroring, but its an excellent starting point for learning. To have empathy, for people you're not actively observing, or for future states of people you are observing, you have to be able to model them first, and then mirror the emotions that the model predicts, which can then update the model. This loop is empathy, its both "experiencing other's emotions" and "the ability to understand and predict".