Once a FreeCAD model is finished, one of the things the author want to do, I guess, is showing it in the detail he/she wishes to the target people .
Wouldn't it be useful for this purpose that FreeCAD have the option (a Workbench o a macro) of "entering into a presentation mode" in which the user could select which objects of the model and in which sequence they would appear/disappear from the 3D view?
Regards.