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Survivorship bias
Contemporary appliances actually do fail more often, and earlier, than their predecessors. They have added a bunch of extraneous things to what was a very simple, stalwart, design. These additions have drastically increased the complexity of their designs and created many fold more points of failure than there used to be. It isn't so much that the manufacturing is sloppier, or that the materials aren't as good, though in some ways that is a contributor, just not the main one.
If you by a recently manufactured fridge like the following, you will get a fridge that will last decades if you do the minimum to keep it in good condition. However if you buy one that has an in door ice machine, lcd touch screen, complex lay out that requires the basic mechanical devices, to keep the fridge cool, to have a bunch of extra tubing, wiring, connections, etc. it is much more likely to fail because of all the extra points of failure you added.