People often ask for a broken line feature in SU. It is explained to them that lines are not lines but edges and so have to be solid. They cannot be broken or have thickness.
However, a line/edge can either show or not show depending on whether it is hidden or not. Is there a reason why the way an edge is displayed cannot be anything other than those two? You could consider a broken line to be a partly hidden line. You couldn’t make it an option under Hide because that also can refer to other objects. But there could be options on displaying edge styles, couldn’t there?
The workaround using Layout is not really a substitute.