This is not at all about defending "BMW knows best". It is a reality though that Roadster (especially 6-cylinder combustion engine) are a dying breed and will soon go the way of the Dodo (SLC and TT are already gone).
The Z4 would not even exist without the Toyota collaboration. For BMW it makes no economic sense to go through the U.S. certification process for to sell 500+ cars more.
M3/M4 are BMW's sports car icon. Hence, here it continues to make sense to at least offer one model with MT for the halo effect.
Done & out.
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Hoc Lapidem Non Vi Sed Saepe Cadendo!
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