> How is that different from cars that project information on the windshield?

Pass-through is done by cameras, not by window. This would more be like not having a actual windshield but a monitor. So you have the same issues of delay, ability for the device to malfunction and go completely black, glitches, etc. Though it is a bit worse, you have a very constrained field of view, so you aren't able to see any of the things from the side. Which you may not always consciously notice, but your brain sure does account for that information.