I'd like to see more tools in Revit MEP that allow the parts to be detailed to a higher level. Right now we use a product called CAD-Duct because it is the only software that will detail the parts to high enough of a level to provide install drawings and fabrication drawings.
CAD-Duct will also export to our Plasma Cutters for immediate fabrication.
We have almost 50+ seats of MEP suite on subscription and I know of at least 100+ seats at other D/B contractors in the area that are looking for this functionality. We hope that one day autodesk will give us everything we need. If we find that CAD-duct becomes more function than and of the Autodesk MEP products then we might downgrade to vanilla acad and just use the CAD-duct package.