This has been done over centuries, and is still standard in Europe, where the embalming fad never has caught on.
When someone dies, their body is taken to a human composting facility [..] After wrapping the deceased in a simple shroud, friends and family carry the body to the top of the core which contains the natural decomposition system [..] It would be done in a contained vessel which [..] would be rotated to provide physical disruption so oxygen could access all parts of the composting material. This would also help control the moisture level.
By the time we completed our trials, we were developing material that was very pleasant to handle, it was a very fine compost that was relatively stable, [and] it smelled good
Where in Europe is this standard practice, exactly?
AFAIK that's not really true, europeans are not usually highly embalmed but they're mostly buried in coffins in vaults rented for years or decades (depending on the country).
AFAIK https://i2.wp.com/www.talkdeath.com/wp-content/uploads/2018/... is a pretty typical-looking cemetery for western europe at least (some countries tend towards just the headstone and no vault, but as an other commenter notes that doesn't mean the body readily decomposes either)
Those are not vaults. Those are just holes in ground with a cover on top. It's mostly decorative and there so that you don't walk on top of the coffin.
We don't usually own these also. Usually city where you live has a cemetery that must provide a place for the coffin.
That would apply to municipal graveyard while church owned ones are managed separately. In either case, if grave spot fee isn't paid on time, space goes back to the pool while remains of previous "occupant" are transferred to the ossuarium - IIRC.