Housing costs - it's expensive finding that big a location and weirdly there is a sort of flip point (in London) where more people stopped reducing the delta cost per person if that makes sense

moving from "just house mates" to "we need some rules as a community" starts all sorts of "oh I don't know if I really want to think of it this way" - and the sort of people who really want to be in a commune with rules turn out to be the sort of people you would not want to have ... earnest and unemployed (see housing cost)

I think "house mates" is a good level to live at - probably for most life stages to be honest.

And we could easily redefine a village (cluster of cave dwellings / Skara Brae / babylonian houses) to be the same house - it was for many ages for many parts of the world one thing we could call a structure