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.
This is a proper unpopular opinion because, as someone who received an organ transplant from a deceased donor, I disagree with it.
I am a huge advocate for organ donation for obvious reasons but I don’t think it should come at the cost of bodily autonomy.