Description
Analyzing and visualizing 3D data is becoming increasingly popular. In some fields, the exact location and rotation of objects are critical. Additionally, when working with large 3D datasets, performance can become an issue when publishing 3D data to ArcGIS Online/Portal, building cache, and visualizing the data in a Scene.
Luckily, there is the possibility to publish a point dataset and add 3D symbology on the client side. The problem, however, is that ArcGIS Online/Portal only allows one rotation attribute to be implemented, whereas ArcGIS Pro allows three rotation attributes.
Use case
Take, for instance, a standard beam. When replacing a point feature with this object (3D symbology) on a ground surface, there are three rotation angles (yaw, pitch, roll) to take into account, depicted in the image below. As mentioned, ArcGIS Pro allows for these three rotations, so no problem: the point is replaced with the 3D object, and all correct rotations (based on attribute information) are taken into account.

When replacing the same point feature with the 3D object in ArcGIS Online/Portal, it is not possible to apply the required three rotations. Only one rotation attribute is available when applying 3D symbology to the hosted feature layer (point). The image below illustrates the differences in options for ArcGIS Online/Portal and ArcGIS Pro.

Benefits
Data Quality: Being able to apply three rotation angles on the platform allows for better data quality.
Usability of the ArcGIS Platform: Having correct data improves the usability of the platform.