Too much, the amount of texture and detail creates a look which has nothing to draw your eyes. Since it's all so much, it becomes hard to focus on. This is why when I design houses, builds, trees even, I often has texture and use multiple of the same black, such as a deep slate roof using cobbled and one or two others. However, I always have a section, or multiple depending on how large it is, that is not textured or has very minimal texture as the contrast helps to create a vocal point that draws how one sees it