Boundingbox intersection isn’t ideal for geometry. To ‘break’ your workflow, draw a duct, pipe, or wall at a 45 degree angle, and a desk just adjacent to the wall (but not touching!) and parallel to it. you’ll see that the bounding box lists the desk as intersecting.
This thread has a good explanation of how to use the Bimorph nodes: Access Revit's intersection checker in the API?
As of now there is no API connection to the interference checker tool; this is mostly due to the fact that the API calls which that utilizes are rather easy to replicate and customize well beyond how that tool works. The thread above outlines several other limitations which makes calling it programmatically less than desirable.