I suspect this is actually what’s changed - labor is so expensive compared to the cost of the machine that people replace their appliance with a new one because it’s only a little more than fixing their old one.
The guy on an assembly line who places a particular assembly in place and connects the tubes/bolts can perform that task on hundreds of machines in a day. The guy who has to drive to each person’s house to replace the exact same part can do maybe 2 a day, assuming he has the right part on hand, and assuming that it’s easy to diagnose which part has failed.
The latest xkcd has one of my favorite hover texts of all time: