A few more thoughts - much of the use of a coop and run is about more than just bird security, it is also about human convenience -- by containing the birds you make it easy to find your birds, find their eggs, minimize your losses, etc. Also, the degree to which someone goes to add certain things to their setups have to do with why that person is keeping birds in the first place -- those that see the birds purely as pets are going to be looking at some angles from a different perspective than those who are in it for production purposes and see their flock as livestock.
Ultimately, any animal we choose to take responsibility for comes with a set of basic needs - meeting those needs is our obligation as good stewards to the animal, anything we choose to do above and beyond that is just a bonus to the animal and/or ourselves.
Ultimately, any animal we choose to take responsibility for comes with a set of basic needs - meeting those needs is our obligation as good stewards to the animal, anything we choose to do above and beyond that is just a bonus to the animal and/or ourselves.