This Feature Update provides a way to specify precise locations on an attached coordination model using the standard 2D endpoint and center object snaps
From the above quote one can infer that they 'forgot' to actually include the parts of cade to make a highly touted feature work in the initial release of the program.
Would not be the first time autodesk advertises or announces a feature; to then have it NOT function as advertised upon release.
One notable to consider; Sheet Set Manager. The fail: that a single layout can NOT be part of many sets, and that was the major touted benefit of SSM.
For the record it is still broken.