well that's news indeed but was the change to the RO or was it to ADT? I no longer have those versions to test. aecMaterials were added around then so was it simply that new stuff was added elsewhere that the RO could play with. About the same time they changed ME's so you could add a RO to an ME. I'm not sure technically if they did anything to the RO or whether it was just a by product of the change to teh ME. Anyway yes they both were good changes and added usefullness to the RO and increased it's ability.
Yes the spot heights for slabs are a great idea, great for terraining slabs I think for driveways and access ways etc. for ACA yes I think everyone must find that addition very useful.
Can't remember exactly which version it happened, but the RO without a material assigned was less useful than now.
Apart from the families in revit, spot levels in slabs is about the only feature I find superior in modelling.