Fine suburbanite, everything that is not a private garden will automatically suck for you, and apparently there is not a single dirty ugly and bad backyard, garden or house itself wherever you live. Here in Brazil, tons of people leave mosquitoes proliferating in suburban houses, turning them into vectors for dengue, chicungunha, zika, etc. Can i say every suburban house is a cesspool too ? are all these Moscow parks , Tokyo parks full of dog shit and druggies all the time too ?

I will tell that to these Parisian people here.

If you live in a high quality house with large space between houses, maybe. Sound is very transmittable by air, if you are in the garden or open a windows there goes the sound insulation. There are tons of houses with ‘special cardboard’ as walls and not really that much distance laterally between the houses, so all the loud sounds will be heard. Again, if you build with bad quality, anything will be bad.

The holes in your logic are the individualism and scale. Very few people will ever be able to live in a detached house like yours, by definition. Either the forest will eventually be cut (rendering the nature dead), or the supply will forever be small and expensive (not accessible to millions of masses). The only way millions of people could have access to a large natural area to hike is indeed apartment blocks urban islands surrounded by large spaces of nature, like the 2nd image. They don’t have to have tens of floors, just 5 floors of large apartments can house many people with comfort while also having amenities (that can be paid sustainably too) to boost.

There are tons of poorly built detached houses as well, that are also not easily or cheaply fixed, that is orthogonal to the debate between house or apartment.

He-She is just telling that there is a difference between a garden and an actual wild nature space. Gardens are manicured environments with a fraction of biodiversity that are made to serve human needs, and also frequently require constant maintenance and resource consumption on garden tools, fertilizers, etc, and frequently are changed whenever the house changes owner or tenant. They do not contribute to nature preservation at all actually, they just provide more comfort to the inhabitants like some trees for shading. A real wild nature space demands a lot of continuous space devoid or almost devoid of human presence or interference, like a whole Manhattan island of trees that will not be cut, and no fertilizer maintenance at all, and big animals that are dangerous to humans such as wolves, bears, moose, etc.