Backing up in a parking lot with direct sun behind the car, lost sight via the mirrors, dashboard camera and parking assist and collided with parking bollard approximately 3' high causing extensive damage to the left, rear quarter panel and wheel well. Parking assist didn't beep, blare or other as it does and has for our yard waste bins and garden cart at the edges of our driveway (backing up in the dark). I believe the fact that cameras only and sun exposure is a bad mix and was sure glad we weren't in FSD and going forward. I think that removing the radar function via software and or removing the connector plug (at a service visit) is both unsafe and a fraud against the purchaser of such a vehicle and radar systems should be reinstated for the consideration of safety whether going backwards or forwards. Wanted to make the complaint first as we also can't get a service appointment for this incident until the end of July. Happy with the overall vehicle but this safety function is fallible and unsafe.