It's not really though. BMW has at various points had the same "interior style" all the way through it's lineup. And you're going to see it again when the panoramic idrive system sets the tone for future debuts. I've willingly bought multiple BMWs and noticed it, and didn't complain about it either. It was familiar.
You'd be hard pressed to tell which one is the 7-series and which one is the 5-series at first glance.
3-series vs. X5. These all seem to be of the same interior style. Who cares? With the dizzying amount of models these brands have for sale, you're going to see the style a lot. I don't think this is a uniquely MB thing at all.