Bumpers, headlights, blinkers, etc, have function for everybody. The JDM parts replace the USDM parts for aesthetics purposes and with the bumpers, you get to shed a lot of weight in the process. The roof rack is an additional piece. It is of zero use to somebody that isn't going to use it.
This is why I brought up the sunglasses in a bar at night thing. Everybody is wearing different clothes to suit their own taste, sure. But then you get that douchebag that goes the extra length to wear a pair of shades in the bar at night for "style". We've all seen it. It's dumb.