I think the 3 above posts are all correct, but for differing reasons .
The well draining ground, typically chalky maybe with stones ,commonly known as 'brash' has the ability to allow surface precipitation to be absorbed quickly, permeates to great depths, and if suitably structured, allows ground water to rise by capillary action to a level which plant roots may descend. Plants need establishing, to cushion the disruption of transplanting, and in the suitably structured soil, should then thrive.
Sandy soils act similarly but 'burn' carbon (as humus ) rapidly, their open texture due to larger particle size ,have less surface area for moisture and more oxygen.They need constant restocking with organic matter, which while decomposing (burning) holds available moisture as if a sponge.
Clay soils have smaller particle sizes, tend to concreate and crack as they dry but hold considerable amounts of water. They can readily form consolidated layers and historically have resulted in slates and shales.Otherwise they are fertile, rich in minerals and carry humus to good effect
Nature has a system, and by utilising dead plant material, compensates where possible to complete its work. Soils need this constant recycling of organic material. Deserts lack organic material ,consequently they struggle , due to erratic or non -existant rainfall, to recycle sufficiently.
I have previously refered to natures' system.The principle of no-dig mimics the forest floor. Regular, annual additions of copious amounts of organic material ensure that nature can complete its cycle. The one significant difference I have noticed (apart from no lower back strain!) , is the amount of root development that my crops make.Clearly this helps maximise their development and makes for good drought survival.
Let me show you a single celery raised intact. I believe the root structure is truly an endorsement of the system