You are ignoring that Germans have a bigger lineup. So people will just get a E-Class or 5-Seriers instead, there a very few people who really need a large luxury sedan, have a chauffeur and take advantage of the executive rear seating and if you want space you get station wagons here. Sure this isn't great for their sales either, but they will make sales while some people might simply be priced out of a Tesla or not willing to spend that much in a uncertain economic situation.