No, Im not joking.
In the 70's bumpers were made of fairly heavy gauge chromed steel. Of course they were designed to deform in a higher speed accident (EG The XJ Jaguar series had collapseable cartridges behind the bumpers).
But at "Parking" speeds (Say, less than 6"/s) one could make contact without causing any significant damage.
Parking by "Feel" was perfectly normal. Indeed, My French teacher at the time explained that it was common practice in Paris to park bumper to bumper by the side of the road and to get out one would "enlarge" the space by driving backward and forward until one had enough room to pull out!
A practice that would reduce a modern vehicle to expensive scrap within seconds!
It should be perfectly possible to combine higher speed safety with the ability to make "Contact" without causing expensive damage.