It might work for some people and I know that in inner cities there are lots Of people with no garden at all but thinking about how I use my garden over the years....
We have guinea pigs, they live inside but we often put them in an outside pen in nice weather for a munch on the grass. We know that we haven’t used weed killer and we know that there aren’t dogs etc also using the garden to bark at them and terrify them.
Kids have trampoline and over the years various other play things. Often had a paddling pool filled for several days in the summer. Would we be able to do that? You would get other kids using it possibly breaking it. Would we be responsible if another child used our equipment and seriously hurt themselves. In today’s litigious society I wouldn’t want to take the risk.
Would everyone have thier own washing line? Would you feel comfortable having your knickers on display while someone else was using the garden? Would you even be able to leave your washing out? Would you want to have a bbq etc worrying about other people’s washing?
Who would maintain the garden? Lots of arguments over who’s turn to low the grass. What if one person worked long hours or had a disability?
Some selfish person would probably put a block booking in
Unable to be spontaneous and have an impromptu bbq or friends round
Wouldn’t be able to leave the kids playing while you get one with something inside. You wouldn’t be able to rely on all exits/peoples back doors being secure
Where would you store rubbish?
Kids wouldn’t be able to camp in the back garden.
Growing veg - would others take it/ dogs poo on your veg patch? Watering would be awkward if the only time you have to water is while someone else is using the garden.
Who decides what flowers etc? What if someone is allergic to something? What if none person likes to use weed killer and pesticides/ant killer and another is vegan hates killing bugs etc
Young kids couldn’t run around half naked as they tend to do.
Wouldn’t be able to leave anything in the garden unattended just in case it went missing eg leave iPad not able while you pop to loo
Would you be able to have parties in the garden?
You would be able to see straight into other peoples back doors/windows. So wouldn’t even feel completely private in your house.