Difficulty "reading" emotions is an common and medically accepted symptom of autism spectrum disorders, and there is objectively measured evidence that it is in fact a real symptom. See https://www.ncbi.nlm.nih.gov/pubmed/15843104

This presents a serious problem to people with such disorders, because they may accidentally make people hate them by failing to understand their emotional state. If AR glasses could continually run face detection and emotion detection algorithms, they could be configured to show a warning if a conversation partner is showing signs of boredom or annoyance. Neurotypical people do this subconsciously, so it is a matter of fairness that people without the ability be allowed to use prosthetics.