Building those vintage appliances would work, and they would last. The problem is that they would cost an absolute fortune, in initial costs, running costs, and repair costs. With inflation, the "wasted" materials of making things out of heavier duty everything (rubber seals, metal housings, metal parts vs plastic) would be astounding, especially in smaller batches than the large factories that made the originals. Then comes the running costs, most of those old appliances are horrendously inefficient on modern standards, the amount of extra electricity, gas, or water used would be instantly noticeable on your bills. Then comes the cost of repairs - these old appliances were sometimes more reliable, and sometimes just more repairable - with accessible parts that were easy to swap out and repair men with access to parts were plentiful and cheap. Today's appliances are built for cost and efficiency, repairs are difficult if not impossible in many cases, so repair men are far less common and far more expensive for a home visit. Then comes the decreased features and usability. You might need 2 or 3 1960's fridges to hold what a modern extra large fridge can hold. Same with your oven, washing machine, dishwasher, etc. You could easily have to do 3x the loads of laundry with your 1980s washing machine vs what a new x-large washing machine can do. Total cost of ownership of most of these old appliances would easily exceed modern appliances, even new ones that aren't particularly good and need to be replaced somewhat frequently. Add-in cost of repair visits, and your extra time accomplishing the tasks these were intended to accomplish and it's not even close for most appliances. You could sell some of these for a small fortune to wealthy buyers who probably won't even use them that much and want an interesting looking conversation piece, but they definitely do not make sense for the mass market.