The Topographic 3D basemap is very useful basemap especially for use in apps like Instant 3D Scene Viewer. Now, in ArcPro, this basemap has popups enabled by default that gives you the building name and height which is very useful info imo.
However, both in Scene Viewer and the Instant Scene Viewer App, you can't select a feature on this basemap. And so just to have the popups you have to add an additional layer.
So kindly add the popup functionality for this basemap (and similar) so that the user does not have to add another layer to get the height and building name popup, cheers.