bradleyland I do not disagree with your analysis at all.
But I will state this: car companies have been making completely different feeling cars on the same platform for decades; they've just gotten better at hiding it in recent memory.
For example, the GM Alpha chassis. It is essentially the same base platform, but it houses the ATSV, CTSV, and Camaro all on one. There's multiple powertrains, feels, and purposes. They all feel unique; it is ALL about the integration by the company.
On the BMW side, the E series has housed all sorts of powertrains and differences. M3/335i/328i and THEN made wagons, coupes, and sedans all on the same platform.
I'm sure you can find more examples of this, but these just came to mind off hand. So in short most money making platforms and kind of "swiss army knives" already. It'll all be up to BMW to do proper integration and make a kick-ass chassis.
Edit: Honda has been doing exactly this with their hybrid powertrains since 'nam with pretty good success as well.
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