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Shitting in a hole in the ground in the middle of nature is serene but also doesn't scale to population density.

Not "in the ground" in the strict sense, but I'm pretty sure that composting toilets would scale to population density. Same basic idea as shitting in a hole (and probably more useful than water-based toilets).

https://youtu.be/DzANRll8ltI?feature=shared

Scaling is not something intuitive to end user. Hard to say "pretty sure it scales" when your usage is so low scale, secondary effects are invisible to you

Of course sewers are amazing but they are used for a lot more than toilets. My point was: Composting toilets do not need to take up much more space than water-based toilets and it's entirely feasible to use them in many living settings. It's also possible to make use of the "waste" by composting it further, using urine as fertilizer and so on.

Oh yes it does https://en.wikipedia.org/wiki/Squat_toilet.

Squat toilets aren't really the same thing as an outdoor toilet in the middle of the woods.

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