Given that embalming was not practiced by Jews, Romans, and Europeans up through the medieval Era at least?
Every corpse buried became food for the worms.
So why is it a problem?
It's not a problem for me, but for some it's a BIG problem.
I guess protecting a corpse is seen as a way to conquer death, to preserve memories. Consider ancient Egypt's sophisticated embalming and elaborate memorials.
Remember the movie Po;tergeist? The house was haunted because it was built on an old graveyard. They never should have dug that swimming pool...
Hypothetically could there be some infectious diseases in which planting an unembalmed corpse in the ground might be a source of infecting others whereas formaldehyde would have killed the infectious agent? I’d doubt it would be a common issue and likely less common than pre-embalming era when infectious diseases caused a higher fraction of deaths. But an honest review of the science might offer a few causes for requiring it. Perhaps anthrax, which certainly can persist in the environment. In rare cases handling dead bodies can transmit disease directly. That’s documented to happen with ebola with folks bleed out covered with still infectious blood. Getting TB from performing an autopsy had its own vocabulary. Embalming can’t prevent exposure before its complete, but requiring ‘modern’ rather than ‘traditional’ care of the body after death, lets ‘modern’ methods reduce significant exposure. Again, not likely needed in most cases, but we should learn from any exceptions. But better to prethink and and debate any needed exceptions in advance as generalities, than to try to apply them as seemingly arbitrary ones in emotional specific cases.