Beat case scenario: your grave sits unlooked at 99.9% of the time and wastes space. In a couple hundred years some douchebag archeologist who wants to pretend they aren’t a grave robber will fuck with your shit in the name of “science”.
Setup a shrine for your loved ones in your house if you have to. The world is for the living. When I die toss me in the nearest dumpster.
Graves are for the living. I’d prefer not to have one, but I’m not going to make demands of the living over it. After all, it’s their funeral.
Always go to other people’s funerals, otherwise they won’t come to yours. — Yogi Berra