Providing a feature in the Project Contents to allow a user to organize their Maps would create more room for ArcPro implementation within a teams workflow structure. This could be a similar platform to Window Explorer where a user as the ability to create folders as well as see the last time a map was modified. Subsequently, a dynamic text referencing the map location within multiple folder would be of great use as well.
PS - My team's current ArcMap workflow contains multiple .mxd files within tiered folder locations for each development project with a .mxd document path file reference in the layout. Our workflow transition from ArcMap to ArcPro would be almost full strength should the map organization become better in ArcPro.