You say that like it's a bad thing in this context. Cars are (immensely) far from perfect, but hey, parts interoperability is non-zero and for plenty of cars (even newer ones) you can still reasonably get them fixed.
It'd be awesome if I could head on down to a phone parts store and pick up a couple of components so my phone can live perpetually in repair, but we're not quite that far along yet.
"Core" charges make a lot of sense for automotive parts that be reconditioned/refurbished. I'd much rather have to make another trip to the parts store to return my bad brake caliper than toss it in the trash. The same goes for something like phone batteries. Apple is dangling a carrot to get people to return batteries (and other parts) for recycling/proper disposal.
It'd be awesome if I could head on down to a phone parts store and pick up a couple of components so my phone can live perpetually in repair, but we're not quite that far along yet.