In spite of the fact that the price of a washing machine in the 1950's or 60's would cost about $3000 in today's dollars, not all machines lasted for decades back then. While there are those lightly used gems that worked without a repair for 20 years or more (like my Nana's 1955 Frigidaire Unimatic,) I recall as a kid washers often breaking down and many replaced after 8 to 10 years. I saw almost every brand replaced within 10 years of age -- Kenmore, GE, Frigidaire, Speed Queen, Maytag, Westinghouse, Norge -- you name it.
I will admit that today's machines have a cheaper feel to them. The steel cabinets are thinner. But most of us are programmed not to spend $3000 or more on a washer. I am also of the opinion that people took better care of things in days past.
I know of a set of Frigidaire front loaders that are 14 years old and still going, having been passed from us to my son and daughter-in-law, and from them to my son's mother-in-law. During those 14 years the washer was repaired once -- to replace the door lock. So there are some machines that still last beyond their expected lifetime despite heavy use.
I did kneel on the dryer once and dented the cabinet (too much pie and cake I guess, Ha!) I could stand and dance on top of my 55 Frigidaire Filtrator dryer without a problem. It's like a tank.