I seriously doubt a real study of appliance reliability over the past 70 years would show that the stuff sold in the 50s is actually more reliable or longer-lasting than the stuff sold today. Sure, you can find appliances that old that still work fine, but you don't see the ones that broke down after a year or two--they were junked decades ago and forgotten about. Since you can't grow the supply of working 50-year-ol…
I do tend to notice the common theme with modern appliances, especially counter top, is that people just don't treat the equipment nicely. put it away as clean as the day you bought it!
large appliances, especially refrigerators just are never going to be as efficient as modern ones.