It's difficult to fully sterilize the compost, and it's very easy to end up with compost that is full of pathogens and parasites. With millions of people in a s

It's difficult to fully sterilize the compost, and it's very easy to end up with compost that is full of pathogens and parasites. With millions of people in a small area, I think that alone makes this idea infeasible. The toilets also don't produce bales of dried poop, the composting only partially completes in the toilet itself--it has to be completed outside in a compost heap. Also dry composting toilets tend to produce more odors than the average person wants to deal with in their small living space.