Guess what I have just been thru same path late yesterday and was about to post results, but your response pretty much sums it up.
We had some discussion over holes and it does not seem to me Mentor will be adding functionality to include all holes in design in any 3D output.
Vias I can understand. Possibly can understand all thru holes within parts, as you do seem them when lining up solid models and the Pads do come thru
in 3D output, so I guess that is OK. I still think the whole hole thing is a bit hokey still I mean the only way hole will automatically export 3D are non-eco
however if you need a plated mounting hole it really needs to be eco if you want connectivity to update. So the whole idea of adding these extra attributes is well hokey, I still say just export all holes period and be done with it. But I know Mentor is still working to improve the 3D functions & it is the first release
of this level of capability. I know they are working on it, but the whole library situation needs work in both flows period, not quite there yet. Also the update or change to a mapped model in netlist flow is a bit more cumbersome than Integrated flow like you say bunch of files in bunch of folders.