Learning to use facial expressions can be quite useful. It's similar to learning negotiation techniques and sales strategies. In this context, spending 15 minutes a day working on the ability to one's facial expression skills (Samsung app: even improve the daily performance in a "performance dashboard") is not necessarily a bad idea.

However, it should be remembered that this is primarily about imitation. It is not about "self-expression". People do not move their position on the autistic spectrum by using this app. They just improve their ability to use facial expressions in the way that is expected by the surrounding society.