It seems like it would be helpful if toposolids were automatically cut by other model elements, such as walls, floors, etc. I can't think of an instance where one wouldn't want this, but others can feel free to chime in if they can think of some. Massing voids are obviously still available if folks need to cut voids beyond these automatic cuts, but it feels incredibly unnecessary to have to go through an entire model's worth of foundations and floors to cut the toposolid.