Adobe walls will wash away with water flow. If the water cannot pool on the adobes they remain intact. Often the walls are two adobes thick. They are plastered with mud or cementaceous plaster. I owned a building that was made of Terrones, which are mud bricks that are chopped out of the caliche layer. The roots of weeds were still in the terrones.
An intact roof is extremely important. There is an old church, well maintained and used, where I lived in NM and we replastered it every two years or so with fresh mud. Was a community effort. The mud plastered pueblo buildings in NM have lasted hundreds of years with mud plaster, some are multi storied. The roofs are formed with a layer of calechi and maybe some straw or brush.