I don't think heat pump dryers existed 50 years ago.
Yes and no. Dedicated heat pump dryers are not that old, but many people have been drying clothes with heat pump based dehumidifers since they were first introduced. There are some pretty old dehumidifiers with steerable vents specifically for drying clothes.
I used to do this when I lived in a flat. I used my mobile air-con unit. I pointed the warm exhaust at the clothing rack and allowed the air-con unit keep the humidity under control.
When I forgot to wash my favourite jeans for a night out, I was able to wash them in 30 minutes and by stuffing the exhaust hose up the jeans directly they were dried in 20 minutes.
EDIT: On white goods longevity. There have been changes proposed by the industry recently (last few years). Previously they were manufacturing goods with a 10 year warranty and building things to last that long or be repaired to last that long.. or longer.
However the industry are claiming that as people are tending more often now to changing things around in their kitchens, like SWMBO wants silver fronts or black fronts for whatever reason. They are opting to build them cheaper and only give them a 5 year warranty and virtually no options to repair them.
So instead of a washing machine that costs £350 and lasts 10 years with repair options and part available, you can now pick one up for £180 that lasts 5 years and cannot be repaired... or is certainly not economical to repair. They are obviously receiving flak for this, rightfully so.