Think John Deere tractors as well as adware refrigerators.
My friend has a microwave from the late 70s. The time/power are set by turning knobs - no fiddling with a bunch of buttons and modes - the turntable is metal so it can't break. The only thing I would consider missing is a popcorn mode, not a big deal.
Edit: Another great example is toasters. Toasters have not gotten better in my lifetime and older toasters are probably more reliable than what I could buy today.
Definitely keep the old dishwasher till it dies.
(The bosch is quiet and cleans well, fwiw. The magic heat free drying minerals are nice. It’s a shame they’ll be in a landfill in a few years.)
There isn't much gain. That's the point! She's got a device that's nice to use, repairable, is well-designed, and isn't serving her ads. She's fine! Really. If she wants a new washer, Miele washing machines hold value and can be resold.
She probably doesn't think about it, which is the real gift. She's free to think about literally anything else! I have an extension to the Vimes boot theory, where you don't even notice your boots when they're working like they're supposed to. Most of us aren't enlightened enough to notice and appreciate that our feet are dry. This reduced cognitive overhead increases capacity for creativity and play, which further amplifies the life outcomes of people buying cardboard-soled boots vs leather boots.
It's still a terrific car. Comfortable, well made, fast enough for all practical situations. Unusally low mileage for its age. An engine that's sought after in the tuner community. But, it's unsellable. I'm stuck with it, whether I like it or not.
The good news is that I like it. The funny news is that I took a new job that will move me to the Bay, and whatever my new employer is paying to move my car out there is definitely more than my car is worth.
Ready example is my aunt: a very good and expensive Miele washing machine, that was made to last as things were before. But now 10 years have elapsed and modern washers come with bigger drums, much lower noises, optimized water and electricity usages, and more effective washing patterns.
But she's stuck with her old and trusty one, because she feels that it's working "like new". And she's not wrong, it works well, so it became a sort of a "golden cuff" so to speak (not knowing any better metaphor). So good and expensive, that now getting rid of it for a new one feels like a waste of money for not much gain.