I'm finding that Permaculture is running into difficulty with it's ideas about what land ought to be.
A feature of Holistic Management differentiates climates by a brittleness scale, and the more brittle (i.e. periodic low rainfall areas) work best with the inclusion of herding livestock.
This isn't Management intensive Grazing. It is holistic management which focuses on improving the biological processes of the land in what ways are available and best suited to that land.
Sure livestock can desertify areas, and some places are better suited to mature forest, but the point is that some areas are more suited for livestock that behave in a certain way, Via herding behavior that promotes animal impact, and the needs of the plants, etc.
For Permaculture to dismiss this point and favor instead rainwater catchment through swales or whatever is to miss an enormous biologically restorative potential.