It's the same reason why BMW doesn't sell the 1-series and big engined wagons here -- the US market is extremely conservative, and BMW NA is extremely protective about its brand image.
The M5 has always had a manual gearbox in the past 20 years, so the buyers expect one in the new M5 and BMW NA certainly doesn't want to destroy that image of the M5's.
Europeans always want the lastest in technology and design, they buy cars for the surprises. Whereas here in the US, people want "the best" and they buy cars to satisfiy their expectations.
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