No, it is useful or at least interesting to anyone who is interested in the natural processes that make our gardens possible. It is useful to people who are interested in using natural processes which may result in other processes which improve our lives. The natural processes are not complicated, but we have to understand them to use them.
I think your point is the fact that country gardeners would seem to have more access to the raw materials and the space to utilize them. The fact is most of us have more access to raw materials than we think. I've never checked out the composting forum on "The Gardening Forum", but I'm willing to bet they have a lot of information on unusual things you can compost from kitchen waste, to newspaper, to coffee grounds, to garden remains.
I was recently watching electrical utility crews trimming trees away from power lines. As they moved along the highway, they were leaving huge piles of wood chips to simply rot. I didn't need the material, but I hope some gardener came along and loaded his pickup with the material for his garden.
I simply enjoy gardening!