Wouldn't it be grand if you could test out different materials by swapping out the underlying definition in a design option? Say I've got 10 different objects (wall types, maybe a ceiling, some curtain wall profiles, curtain wall panels) that are all RED but I'm interested in seeing some design options for BLUE and GREEN or WOOD or CONCRETE... Currently the only way to achieve that is to manually alter the material definition or swap out the asset for something else. Offering a temporary and managed switch in design options would be a fantastic way of managing this process.