This topic always makes me laugh now.
Sure, statistically, older appliances used more durable materials; more metal. But that's what was cost effective at the time. And yes, prices were absolutely higher back then. They were luxury items. Now they're commodities, with commodity priced components. Many of which are Chinese or Mexican made now.
My parents paid over $2000 in 2016 money back in the day for their Maytag set. The dryer lasted 20 years. The washer is still going! But it's on borrowed time. I bought my modern Maytag front load set for about the same money (a bit less) and got all sorts of bells n whistles. Will it last 20-30 years. NO. I know that. But I'm confident I can repair them if I need to. Even if I need to buy a rear tub kit with a bearing.
Alas, I do not believe that type of longevity is typical. I think we're lucky. I don't know ANYONE anymore that has appliances that even go to the 90s.
Sure, use has a lot to do with it, but parts just simply break down.
And that '82 Maytag has not been without repairs. It's just "more repairable" than others. Especially today.
Being in engineering, we're squeezed on price much more than in the past because companies really did invest more in their products to compete. But at the same time, we still do try to engineer things to the best ability of the allowed price. Not to mention raw materials and manufacturing costs are way way up from what they used to be.
So there's a myriad of factors.
Yes, lots of more parts are plastic today. Paint is thinner, metal is thinner. More sub-assemblies are glued or sonic welded together, so replacement is harder. But it's all those sub-assemblies that allow faster, easier initial assembly and keep costs down. They keep these machines light for transportation costs too, which are also sky high. Especially when you ship stuff across the ocean (eyeroll). In addition though, you can do many more amazing things with plastic than with metal, and many plastics ARE stronger than some metals in certain applications.
In truth, the costs are moved to the consumer now, for repairs. Because now they have to buy a whole sub-assembly, because that one gasket or solenoid are simply NOT stocked anywhere. They're made to order and pre-assembled before they ever make it to the appliance company.
But.....BUT....if you are skilled (rare today I know), you can totally change out a tub bearing sub-assembly, or get replacement resistors/relays at Fry's and re-solder them to your control board.
It just all depends on how much down time you allot, or skill you have, or if you think it's even worth to repair.
There is also the strong factor of real market research that companies do. And consumers are NOT blameless here.
Whirlpool knows they must make x% profit on a certain machine to sell well in the market. They also know it costs x to make it last 3 years, or 20 years. And STILL make their margin. But the market price today keeps that cost/margin ratio far down. And the only way to raise it is comparatively with bells n whistles. The consumers just will not spend x money for washer or dryer. That eats away at the margin left for profit, design, shipping, components etc. The market squeezes you from all directions. Home Depot squeezes you. Wall Street squeezes you. Consumers squeeze you, as well as the shipping and labor. People just won't pay to cover those costs. So materials quality suffers to be the bare minimum to get it to sell.
The one aspect though, that I do find particularly egregious, is the influx of ONE YEAR warranties on appliances. That's really a slap in the face.
That totally reeks of "we slapped this turd together and we don't trust it either."
That or they warranty the stuff they know will never break.
My Maxima set has 10 warranties on the motors and drums. LOL!
Those NEVER break! The drum? Really? LOL.
But the bearing? LOL! Yeah on day 366, they won't touch it with a 39.5 foot pole.
There's a lot of economic factors that have gotten us where we are. But there's a lot of greed as well. It's the influx of "money people" running companies instead of manufacturing or engineering folks. Like in the past.
The only thing that will change this is if consumers get upset enough to start up many more class action lawsuits for shoddiness.
While at the same time we should be thankful for how functional our appliances still actually are. And the fact that many many of them are still at least designed and fully assembled here (even though the BOM parts are often sourced elsewhere).
That's my 5 cents. (2 cents in 1982).