Hey @Tom.Sargent,
thanks for the feedback! In the Next-Gen ETABS Connector, these associated units are appended to avoid any confusion.
With your recent updates using Manager, the v3 ETABS connector would have been automatically included. Feel free to give it a spin and let us know what you think!
Side-note; for Revit-ETABS workflows stick to the v2 Connector for now. Refer here for further clarity regarding supported workflows with the Next-Gen connectors: here.
But back to your example, since Speckle is just your transport medium from Revit to ETABS and no manipulation of the orientationAngle is possible in the viewer, the integrity of the input angles will be preserved from sourceApplication to sourceApplication.