It is ver distracting to folks around you if your are in the passenger side of a car and the sun catches the mirror. It is especially bad in the southwest sun.
suppose it could come in handy if you've got something stuck in your teeth or for a quick makeup check (this may not apply), but can see how that would be annoying to passengers in the car. Any way to etch or paint or tape over it?
The mirror is there so you can be sure you are in photos you take of yourself--or yourself and friends. What a great feature in this 'document and post everything I do' culture!