There is a real safety concern with this modification, that actually exists with all of the 6&7 seat configurations. Unless the passenger in the 3rd row is a child or and adult who is short in the thorax, most likely their head will extend up into the rear cargo window recess, which is framed out by the rest of the rear trunk door. Upon a sudden deceleration or frontal impact, the forehead of the rider in one of these 2 seats will very likely come into contact with the solid window frame, and potentially cause a severe neck or head injury. It could even occur with a rear collision, as the head can recoil forward. For this reason, i do not allow any adult who is tall enough for this to occur to sit in the 3rd row. Overprotective??? Perhaps yes, but this is a real safety oversight in the design, that should come with a warning from Tesla.