I’d argue that planned obsolescence is about designing something to break early and shorten its useful life, while graceful degradation is about designing things that are resilient, that work even after being broken, to give them as long a useful life as possible.

In that vein, the flashlight is a useful analogy even if you could argue it’s not an exact example - it works when it power source is at full, it works when it has fewer power sources, it works when it has less energetic power sources, it just tones down its output to match the power it has available.

Apple, on the other hand, went out and said “if you don’t buy a new phone we’re going to make your old phone run slower”. I think the battery life was just an excuse - did Apple really think its customers would rather have a slower phone than a phone with shorter battery life? Sounds ridiculous.

If you want a better example of graceful degradation in technology, think about solar panels. Solar panels gradually become less efficient with age - a 20-year-old solar panel is working at about 80% of its original efficiency. And for high efficiency needs, like powering a house where you have limited space to put solar panels, 80% might not be good enough anymore. But a solar panel that works at 80% is totally functional for other uses where less power is needed, so you can repurpose it and swap it out. And as long as somebody doesn’t drop a rock on the panel and break it, it can keep going for decades more.

Less efficient panels can be repurposed for systems that need less power. Older computers can get new operating systems and be repurposed for less demanding uses. Some things can be repaired indefinitely, and some can’t, but even things that gradually and inevitably decline in efficiency can be repurposed instead of being discarded. That’s the sort of resilient design we need for a sustainable future.