With all due respect, I don't think this is a "German" trend. Mercedes Benz, Audi and BMW have all offered iPod connections and bluetooth for some time. If I recall correctly, BMW were one of the first companies to do so. See
www.ipodyourbmw.com for example.
I just think it's a "Porsche" thing rather than a "German" thing. IMHO Porsche simply doesn't treat "gadgety creature comforts" with the same degree of importance as other manufacturers.
Since Porsche is moving gradually away from being a volume producer of a narrow range of very high performance sports cars to being a volume manufacturer of "sportier performance cars for all" (where there is a model for everyone as illustrated by the presence of the Cayenne, Panamera etc in the model range) then they will need to appreciate that this changes their customer profile and those different customers simply expect different things from their cars. i.e. the guy who buys a GT3 RS may be a totally different person with a different family situation from the guy with a Cayenne S with kids who want TV screens in the back of the front seat head restraints.