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Smartphone manufacturers still want to make foldables a thing
(arstechnica.com)
This is a most excellent place for technology news and articles.
I think a compounding factor is that the lifespan of phones has also increased. Phone manufacturers are no longer selling a new model to the same user each year.
Also the providers aren't subsidizing the costs as much, probably after realizing that betting on people staying on their plan past the end of the contract led to people just chasing those incentives at other providers once their contract was up.
Not that they aren't subsidizing phones still, they just aren't throwing a hundred or two in gift cards or prepaid credit cards on top of the phone anymore.