Single line diagrams, both 2D and 3D, are essential for the established MEP workflows anywhere in the world.
All the MEP lib parts should have LOD (or whatever it is called in your village) of 100 to show only the centerline, in 2D and 3D, 200 to show the geometry size, 300 to show the connections and hangers, and 400 to show pipes, trays, cables, connections, hangers in detail.
This is missing from the MEP modeler. The industry is not going to change overnight, as is obvious with BIM being around for 30ish years and still being considered new, so please provide the usable tool that can produce documents for the current industry, however "backwards" it can be.
ArchiCAD since 4.55 ... 1995