Do you know there's a lightbulb that's been burning for 100 years?
It used to be that if you built appliances, you could do a damn good job. Take pride in your work, throw in a lifetime guarantee.
Craftsman did it! Zippo did it!
But there's a problem.
If I sell you a vacuum that lasts for 60 years, and everyone buys one, now I can't sell anymore vacuums.
So I sell vacuum maintenance. But even then, you only need maintenance every so often. I don't get repeat customers if I sell high quality appliances.
And so I go out of business. And I have nothing to pass down to my family.
So I either raise my prices or make worse vacuums. If I raise them too much, some people can't afford them. They'll buy cheaper, worse vacuums. Those vacuums will break, and they'll buy them more often. And I'm out of business.
Or I make cheap, crappy vacuums and depend on repeat business and everything slowly gets worse and we end up with a world full of grandpas complaining that back in my day, you'd buy a vacuum from Charlie and you'd have it for 60 years, or give it to your son when he's old enough, and now everything's gotten worse.
And he's right.
See Also
u/MalificViper on Planned Obsolescence:
I'm an appliance repair tech. It's not all bias. There's been a lot of switches from durable AC motors to cheapo DC motors, compressor windings aren't as good, the amount of copper gets shaved down, more plastic parts are included, belts are thinner, and so on.
The cost of a washer and dryer from the 70's is like 4 grand adjusted for inflation though.
Basically these appliances commanded prestige prices, and you can't expect a $50 blender to last an entire lifetime.