Mrs S's father died 3 years ago. He was a doctor and left his remains to medical research. The family eventually received the cremated remains of what was left a few months ago. All well and good.
But, an unforeseen consequence of this was that there was no funeral, so no opportunities to say your "last goodbyes", so the grieving process has been a bit disjointed, so to speak.
The family did consider having a memorial service (with no body), but lots of dithering and inability to come to a joint decision meant it did not go ahead.
Me personally? I'd be happy to leave my body to medical research, but it can leave additional problems for those still alive if they are unable to get "closure".