Turns out houses are getting smaller for most people,and less interest in gardening and outdoor activities, sitting around and playing on there phones all the time will create boredom. And without having goals in there life to keep them motivated is one of the key things to prevent depression. John kirwin also stated this in his book. Apart from people with chemical inbalance

Living space per person has tripled since the 1950s for Americans. House sizes have gone up and family sizes down.

I do notice that new houses seem to be built to maximize house size and leave little for the garden. I assume most people want that. Personally I've got a large garden, although it's a lot of work.