What I remember reading about in the later '60s was the "Grosser" Mercedes, which was a shorter-wheelbase limo that had (at that time) a strong V-8 (the 5.0L I mentioned), could run WOT on the Autobahn all day (140+mph) as an "executive transport" of sorts. Oh, and it could turn corners, too! I remember being very impressed by it, from the article, in the late '60s.
But when I finally got to sit in a '73 Mercedes sedan, I was NOT as impressed as I thought I should be. HARD seats, unsophisticated switchgear, Becker radios that were NOT stereo, etc. Nothing to make me shy away from a '74 New Yorker at all!
Back then, Mercedes had the reputation of engineering greatness, which I respected. But the tactile things turned me off for a "luxury" brand vehicle.
Remember, too, that in the USA, we only see SOME of the total Mercedes line of vehicles. The better ones. Like when we found a gray-market place in Dallas that was converting E-class German-spec cars to USA specs. Rather than a nicer leather or MB-tex interior, it was plaid-insert vinyl that looked more like a taxi cab. A Checker would have been envious, though.
Checkers were mainstream "people movers" and little more. Utility rather than low-level "niceness". Geared toward the taxi industry than to replace normal citizens' cars.
CBODY67