I'm sympathetic to the original poster and well-expressed post. We do live in a consumerist society, where people want their shiny new toys and where economic activity and people's livelihoods are dependent upon people buying new things, buying more things, and buying even more.
It seems that Apple is the master of introducing new products with just enough difference (improvement) that people (who feel the need to) can rationalize their purchase by citing a particular feature — 48mp camera; reintroduction of MagSafe; titanium; supposedly thinner; faster processor with same battery life; temperature sensing or crash detection; dynamic island; bigger screen; etc.
I'm right at the tipping point between keeping an old device going and buying new. I've been hanging onto a 2015 13” MBA even though one USB port is shot; the other is flaky typically requiring a non-powered USB hub for iPhones or iPads to connect; noisy fan comes on during certain operations; dull screen compared newer models; runs warm or hot during banking and spreadsheet operations; and battery life is short enough that I need to have the charger handy.
But it has that incredibly useful SD card slot for camera cards, a 1 TB drive needed for all my photos, a good keyboard compared to many recent ones; and that well-worn feel to it that means I worry little about banging it up while schlepping it around, even within the house.
Yet, after listing all the deficiencies, and limited positives, it makes me realize that it is now finally time to seriously consider a brand new (or even refurbished) M2 15” MBA 16GB, 1 TB — perhaps a Black Friday purchase. (While I briefly considered a used, excellent condition, with new battery, 8GB/1TB 2017+ MBA, there are unknowns, quality and wear issues, even with supposed warrantees.)
I relate to the washer, dryer example. We recently had our dryer fixed — at a fraction of the cost of a new one. The old rule of thumb is if the repair costs more than 50% of a new one buy the new one.
Of course, the other wrinkle is that the old ones are easier to repair and last so much longer than the new ones. That's at least one major difference between the household appliance and a Mac laptop. Unlike the dryer, I'd expect a new MBA to have a longevity as good as the old one!
Plus, and of great importance, the gains going from a run-down 2015 to a modern 2023 Mac would be enormous.
Sometimes, it is time to treat oneself!