They should distinguish them differently. Calling it a "Roadster" is misleading. The "Coupe" designation is terrible too. Who wants to pay all that $$$ to have "Coupe" tagged on the B-pillar. What's next? The M3/M5 will have "Sedan" badging to separate it further from the M4 "Coupe".
At least Coupe & Targa would have made more sense.
Or offer a single model with an optional removable glass top like on the Corvettes.
__________________
/// M3
|