Very true. BMW had the flat twin engine as a sign of identity, but they were clever enough to realize they needed to diversify in order to reach some other niches of the market. Even when their R&D department must be one of the best of the industry, developing a new engine takes time and they are just starting wit the vertical thumpers and the like.
My father used to have a Mercedes MB100 delivery van, beaten to death. I will never forget the day that the hand-operated window mechanism broke. I dismantled the van door, took the part with me and went to the Mercedes dealer. Partly ashamed with my dirty clothes I crossed the dealer showroom where all the gleaming Mercedes were showed and went to the parts counter. In a few minutes I went out the place with a new mechanism and I remember it was not that expensive.