I think it is important to do what you can to protect different aspects of your privacy, but it's also important to be realistic. If you are using a stock apple or andriod phone with facial recognition to unlock your phone, the idea that you can achieve any sort of facial recognition privacy at this point is probably retarded. Cameras are everywhere. You are being recorded by your own devices & by other people's cameras basically everywhere you go.
Reducing the spyware in your own home is far more important to focus on than what happens in an airport or some other place that you really can't control.