This type of odd option exclusion is not new when it comes to German brands. Years and years ago, CD changers were optional, and worse, were a dealer installed accessory. MB still charges for Xenon and Parktronic on most of their lower models.
ED on 9/14/2017: 2018 540xi Mediterranean blue, Mocha. M Sport, Driving Assistance, Luxury Seating, Executive, Leather dashboard
ED on 7/18/2014: 2014 550i, Space Gray, Mocha. M Sport, Cold Weather, DAP, Executive, Lighting
PCD on 9/6/2011: 2011 550i, DSB, black/oyster. Prem 2, Conv, Ventilated, HUD, Sport, DHP, SAT