Revit structure should be a unique software on it own, independant from having an autodesk account or, importing the project for structural analysis on Robot SAP. It should include every extension to ease the job and delivery.
Why? Internet is not available everywhere in the world and is not accessible to everybody. Not everybody can have both REVIT and RSAP mostly, when it comes to enterprises, Contractors and Architectural Companies.
It'd be better to have all in one SOFTWARE.