it’s not just phones, though. None of my refrigerators, washing machines, dishwashers have ever lasted more than 10 years; I think the average is about 5 years before they stop working, get all rusty or a very expensive piece breaks so they are not worth repairing. Meanwhile all of my granma’s old kitchen appliances are still working perfectly after 60+ years of service.

Sure, it might be just that over-optimizing how cheap they are to make also makes them less durable, but I don’t see a lot of motivation from companies to go out of their way to build durable things either. And it’s not that I think Corporate = Bad; as you say it’s a cost/benefit thing, it’s just that the “benefit” companies try to maximize is their shareholders’, not our planet’s. It’s on Politics to create a legal framework where some of the cost to our planet is shared with companies (so they have incentives to make things durable/repairable again) and on us consumer to choose wisely what to buy, when and from whom.