Money. Time. Proprietary competitive information.Of course, it is ridiculous that I have to treat the workings of the Smart ED like some kind of mystery puzzle. Why tf can't I just call someone at Mercedes Benz who should refer me to an engineer who know all this s?
Do other manufacturers have engineers who can chitchat with customers who are passionate about the product? Can I call up Apple and talk about my phone's engineering? Can I call up Ford and talk with an engineer about the sick 351 that I'm thinking about swapping from an old F150 into my Mustang? Or Intel about the latest hyperthreading information leak bug?
Though I agree that it would be helpful if more technical information were published, I don't think that a live conversation with a knowledgeable engineer on demand of any enthusiast is realistic.