I think composting is an awful term for a very beneficial practice! There are green cemeteries that are of interest to me where the body is wrapped and placed directly into the grave to decompose naturally rather than placed in an expensive casket which is then placed into a concrete vault. That just does not make sense to me. Cremation is not pleasant to consider and is not good for the environment. But whatever method is used I still like the idea of a memorial stone with names and dates.
I agree, it's a bit awful, but whoever invented the term, probably thought about the decomposing and returning to nature as a compost. But this is just a supposition. A stone is nice, we both agree on that.