I, also, have not read the book.
My thinking is that the so called "composting toilets" are probably mis-named. I think they are more like "
poop cookers." They encourage you to not
pee in them. And then they use some sort of
energy (sometimes
solar) to dry out the poop. If the temp is hot
enough, the poop will be sterilized. Then somebody has to move the poop. But at this point, it is quite safe for use as almost anything. The only concern might be what kinds of meds a person might be taking that is still in the baked poop and might not be good to introduce to your soils.
If you have standard poop (not cooked), I think minimizing the surface area is wise. And to keep it from the air and bugs as much as possible is wise. Frankly, a septic system seems optimal to me. But it is expensive and it does use a fair bit of
water.
One thing I keep thinking of is hearing how peace corps folks teach folks in africa to stop pooping in the woods. Apparently flies go out,
land on the poop, then come back and land on their food. And lots of people die from this.
So I like the idea of a properly managed outhouse. A big roof. Rain water is directed away from the outhouse. And people are asked to not pee there - just poop. Lots and lots and lots of sawdust is provided. With a healthy system there should be no smell (or almost no smell) and nobody should ever have to empty it. With a nearly dry system, nothing should end up in the ground water.
I like the idea of building an outhouse on skids. And then if the hole ever does fill up, you can just move the outhouse to be over a new hole. Put a nut tree seed on the old hole. If you grow the tree from seed, it will develop a fantastic tap
root (transplanted
trees nearly always lose their taproot). By the time the tree bears nuts, the pathogens will be long gone.