I think al78's post brings some common sense into this discussion. We grow crops to eat, not to try and emulate nature in our back gardens or rented plots
I would imagine that growing crops to eat is the primary reason most would give for having a rented plot (though not a garden, perhaps) but I'm not sure how true that actually is. You only have to look across an allotment - there are around 200 plots where I have mine - to see that growing veg for food is not just, or even mainly, what it is about. That would be a bit like saying that the purpose of painting is to cover a canvas with paint. That is the end result, but it is just not what it's about.
Why do people cling on to plots that they are not looking after (in my opinion, anyway)? Why don't they weed or compost or even water? Why do they come so seldom? And yet they get in a state when the field sec. suggests they shape up or ship out. They are obviously getting something out of it that isn't even an end product in some cases. While other people - and they are usually quite fervent about it - get their biggest thrill out of emulating nature (to varying degrees) in their growing practices, even if the basket of veg at the end is a bit holey and spotted and small. (Hide the Roundup - and the spade!)
I'm finding the variety rather fascinating.