>>>it shares the Impreza platform, but not much else
That's like saying the Legacy GT shares the Legacy platform but not much else. The WRX IS AN IMPREZA. PERIOD. It always has been; always will be. Same body, frame, interior, exterior, etc. etc. The ONLY thing that separates the WRX from the rest of the Impreza line is the engine and transmission. All other differences are minor tweaks. A WRX IS AN IMPREZA. That's why it's called the "Subaru Impreza WRX".