There is no road traffic in Berlin. And there are no roads or highways visible. Highways should be visible because they are on the satellite images, but I didn't see any. Probably the image resolution is too bad. I didn't examine it that closely.
It is possible to add traffic to an airport scenery (or other). This has already been done in the Innsbruck scenery by Orbx. But such a scenery has to be created explicitly. It is not part of the standard scenery.
Of course we can wish for it and also demand it. But all these wishes have already been mentioned in the past. Your wish too. With FS4 we got air traffic and better clouds. And the development continues.