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Also the 6 cyl thing is subjective.
I still have the e39 530i which was THE engine you had to have back then: 3.0 - 6inline - 24valve with double vanos. No turbo's, but velvet smooth and in 2002 considered adequate to propel a real sport saloon.
When you wanted an engine with some "grinta", it needed displacement. The fast rise of the turbo changed that. Around 2010 the technology allowed for twin scroll and/or VTG and they also had the heat problem much more under control. So then the main critiques of the turbo were countered and it became ubiquitous, also at BMW. Effect: no more big displacement needed, just a better turbo and you get better efficiency and more torque! This revolution progressively killed the atmosferical 6cyl and pushed the 6cyl higher up the range.
So, yes, a real typical BMW of the past was with the 6 cyl, the BMW of the future will most certainly have not.
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