Because they're not old enough to remember / use other 1950s designs.
I've built a partition between driver and van body on my 110, fixed behind the driver, removable behind the passenger. The body and cab were given the big rubber floor mat, flashing tape, eva foam routine to cut noise, but it also keeps in heat.
The heater was cleaned, both inside and out, and added new seals.
Now the cab can be quite warm.
Monday, I take the dash apart to repair the wiper mechanism , I'll add more sound / heat insulation while I'm in there.