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I'm not sure how you drive on the highway, but I don't usually drive at a constant speed. Instead, when I need overtaking power, I have fast throttle response with a turbo that is already spinning.

I'm not familiar with what BMW did for a 335, but I do know that the 335 is quite a bit more expensive than an A4.

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Even at idle the turbo is spinning. Engine RPM at highway speeds isn't vastly different than engine RPM at city speeds (perhaps a few hundred RPM in the average car). Therefore turbo lag also isn't vastly different.

Variable vein enables turbos to match engine speeds more quickly. Greatly reducing turbo lag.

Come on; it's not producing boost at idle which is clearly the point. Excuse the slang term "spinning".

And I call bs. You're being argumentative. The debate wasn't highway vs "city speeds" it was highway vs cold stop.

A more advanced turbo solves the problem in a car that is $15k+ more, and I believe you that it can reduce turbo lag. For that price range a twin turbo can as well. But there is still physics that cannot be overcome.

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