Simple. It was based around a real race car but was built for the streets.
This car for its time was the McLaren F1 of its day. It held exotic materials, it had fuel injection, disc brakes. Tube chassis,
The Doors were not a gimmick like Tesla they were how they worked around the chassis and were there for a reason.
This was the car that linked the F1 cars of Fangio to the street cars of the 300 series.
Many cars like the Daytona were just body changes where these two coupes were the whole package.
Being there were only two coupes rarity is even more vs the 250 GTO.
These cars represented the high point of Benz racing for the last 50 years. It also was the end for a while due to LeMans in 55.
Imagine had the car had not gone in the crowd where Benz racing may have gone?