Honestly I don't understand this obsession people have with where their corpse goes.

I mean, you're dead. If you're buried, cremated, buried at sea or whatever it certainly doesn't matter to you, faith systems notwithstanding.

Perhaps your family will have some psychological attachment to being able to visit your grave but your body doesn't actually have to be there for any of this.

In some places space isn't an issue but in lots of places it is such that there are long waiting times, it's expensive, you only rent your grave spot or some combination of these.

I mean at some point doesn't the Earth become a giant graveyard, assuming death can outpace subduction.

Here's the areas where I have a real problem with the emotional attachment to your corpse: organ donation. Refusal to allow your dead body to literally save other people's lives is the very height of illogical selfishness.

Some religions even prohibit organ donation (or just make it practically impossible). I hope those who holds that view are consistent enough to refuse organ donations.