Vehicles of the 1950's were a pleasure to work on. My first car was a 1955 Chevy station wagon that I bought in 1970. Even the owners manual of that era was full of detailed instructions, with photo's and diagrams, for working on and maintaining your vehicle.
A 1950's mechanic placed into a 2013 world would be LOST!
First off, there is no room in the engine compartment to work on a 2013 vs a 1955 vehicle. To repair and maintain a vehicle of 2013 would cost a fortune with the specialized computer tools and hand tools needed for repairing your vehicle. Today's vehicles entail removing multitudes of working items just to replace the worn item.
IMO....a 1950's mechanic put into 2013 would be shocked to see all of the US Automobile manufacturers that have gone under and no longer exist.
America, unfortunately, has a habit of continually shooting itself in the foot, with outsourcing and "planned" obsolescence when manufacturing vehicles after the 1960's. A 1950's mechanic would be shocked at how far down the ladder America has fallen with Automobile manufacturing.
America can put a man on the moon but could not, or would not, produce quality vehicles after the 1960's.
Now America has trouble manufacturing a quality automotive product that is easy to work on and with parts readily available. Now, we have a hard time producing a quality product for our citizens at a fair price.
Trying to compare the 1950's vs 2013 vehicles is like comparing the "Stone Age" to the "industrial revolution" of the last century.