We do not need our bodies once we leave this world regardless of what you think happens after we die. We should be focused on curing diseases and extending the life of living humans. Science would go so far if we used human bodies after death instead of requiring people to give consent to something they don’t need.
Long before I met her, my wife worked in mortuary sciences. I often forget that, though, because she got into different fields and I’ve never encountered her in her original environment.
Still, every once in a while she’ll come out with something like “so once I was working on this dead guy” and, well, let’s just say all the attention in the room will suddenly be centered on her.