I agree, and they explicitly state this as one of their three goals (" is an important step forward for developing multi-agent AI systems, for building intermediating technology for machine-human interaction, and for advancing the progress on interpretable AI.")
However, I think this will be even more valuable in human-computer interactions (their second goal).
Consider: if you just had a fight with a lover, and then had a bad day at work, and Alexa recommends that you watch a Black Mirror, it might be awful timing. In fact, as humans, we know if someone walks in panting, and frowning, and slams their hands on the desk, we shouldn't crack a joke. I think there was some research out of Google X about how much more useful robots seemed if they gave out signs of what they were doing (appeared frustrated if they couldn't complete a task etc).
