'til you split one when somebody hits you in the parking lot with a trailer hitch, and doesn't tell you. Then you replace both license lights, do the best you can with the rear plate, replace the plastic cover over the plate, and procrastinate for a year on fixing the bumper itself.
That'* when you figure out it'* some sort of pretty darn flexible plastic of sorts. The FSM calls it out as plastic in the guide for body repairs. I'd have to look it up again. Regardless, you'll be painting over paint, but it does flex.