No offence taken by me josusa
I know exactly the type of garden you mean though, but in those people's defence, not everyone is particularly interested in gardening, or has the time. Maintaining a 'space' is often all they can manage. Young couples like my nephew and his wife, have a young family, and like to have friends round etc, so making time for gardening is tricky for them.
Having said that, as a lecturer, he's been able to spend quite a bit of time planting a few bits and pieces during the last couple of summers!