Because the long-wheelbase partitioned sedans were built to be chauffeur-driven, the front seat can't slide back far, leaving tall owner-drivers cramped. Commenters repeatedly flag this as a genuine usability factor for a modern collector who won't be chauffeured, noting 'the chauffeurs in those days had short legs.'
Cramped driver's compartment in the partition sedans
Mercedes-Benz 300 Adenauer (W186/W189) · ownership