Everybody in suburbia wants a big yard and a walkable neighborhood. But the street frontage that big yards produce reduces density, and that lack of density leads to stores that are only accessible by car.
It gets worse. Since people are driving (not walking) to stores, stores must then have parking lots several times bigger than the stores themselves. This dramatically reduces store density, making "Downtown" style stores difficult to manage. You not only drive downtown, but store to store.
You now need two cars to get anywhere, which means you need a garage. And a garage means a bigger yard, and houses pushed back from the street.
All this traffic is dangerous for kids, so you start to build cul-de-sacs, to reduce the through traffic. You leave your house and see only your neighbors in distant yards driving into their garages.
One day you go down to the city, and in a tiny little neighborhood sit and watch the diverse people walking by, the street life and the energy. You ask your spouse or partner how everything went so wrong -- wouldn't it be nice to live in a place like this? A place not full of snout houses and strip malls?
This is what online communities are like as well. Everybody wants to comment, but hates having to sort through long comment threads of esoteric arguments. Everybody wants to format, but feels overwhelmed by the experience of other people's formatting abuses.
Everybody wants a Big Yard and a Walkable Neighborhood. If you want to resolve that issue, markets alone can't do it for you.
But there are some historically useful examples of common land use that might apply here, and that predate by a long way the current sharing economy. See for example Allotments.
See also Incremental Caging