BMW screwed up when it went to the turbo cars - IMHO it did not consider the enthusiast market. Increasingly a sales numbers driven org I suppose.
The track path has been longstanding - chassis 114/E10 et al old school, a blip of E21, but really jumped to E30 forever, then E36, then E46. Various engines (not worth digressing). But when BMW went to the turbo platform, the NA motors didn't cut it for the e8x/e9x (sorry a small number of E92 cars don't count as a significant path). BMW in its attempt to meet various parameters with the N54 "system" didn't consider a way for that system to be configured for track use.
Historically speaking, american manufacturers did not make cars that were well suited for track - brakes and suspension being the long pole in the tent. But in the past decade or so that's changed. It's a new world and nice to have choices!
Filippo