Maybe controversial, but I don't personally see an intrinsic problem with people wearing these things while driving so long as the passthrough is sufficiently low latency and has high enough resolution/fov. Of course the running apps need to not be too distracting, depending on how autonomous the car is. I could honestly see them being a net positive to road focus by overlaying speed and navigation on the user's field of vision so they don't have to glance at their dash speedometer or navigation device all the time. Only fundamental problem is how reliable the passthrough is, but it would take all of a second to whip the headset off if it suddenly went blank for some reason (which would be dangerous, but doesn't seem to be likely and most drivers regularly experience worse obstructions than that hypothetical one).