ArcGIS Pro is enhancing in creating 3D Content. If the user has created one, of course it may be shared as a web Scene. However, some consumers may not have the ability to Access this web item for many reasons.
Alternatively the 3D PDF would engage them to Access the Content without any web Access and without any Software installed on their machines except for the Adobe Reader. (like you already do with the app drone to map: this app exports 3D PDF already).