Just saw this Model 3 today and noticed that the tinting does not go all the way to the back like the original prototypes. Without full infrared heat blocking it may get a little hot back there. The rear passenger seems to be covered from above, but not from behind. What caught my attention was the rear defroster heating element lines, which are not as visible on the Model X because the tinting goes all the way to the end of the glass. One advantage would be better visibility through the rear view mirror.