It's based mostly on how much re-use the textures can support. The chair textures for example can't be re-used on another model. The details are shape-specific. One way to figure it out... think about making the asset, and whether it can use a tiling texture or not. If it can, then you can reuse the texture elsewhere. Also…
But there are some special cases. Lets say you have a few different tiling textures for different wall surfaces. Lets say you want to break up the tiled look. Here, you can use Decals, or some kind of texture blending, and the end result will look like there are "unique" textures, but actually they are simple tiled ones,…