The arches are from MB history. The Sindelfingen body, aka the Pontoon of the 1950's. Sorta a trademark for Benz, like the analog clock on the dash.
Not saying it works in the new designs, but that's why they are there.
One thing between the 750 and the S, is that the S is the car I'd rather be in if I got into a major accident. Safety has been important with MB throughout history. Not so much with BMW, unfortunately.
MB has a much longer auto manufacturing history over all the other mfgs.
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