I hadn't noticed that specifically but it explains how some of my sub-assemblies have been screwed up and I couldn't understand how they got that way. We use certain door sub-assemblies and when you open your assembly and the doors are hanging off the ceiling or on backwards it is alarming and a time waster.
When you have a lot of people with varying degrees of expertise working on these assemblies not everyone understands how to change a configured sub-assy (properly). We have people come in who are transitioning from other CAD packages (Pro-E, etc) and to my knowledge other packages do not allow you to do this type of "deep editing" so they don't know that they have hosed up a sub-assy. .
They need to just remove this functionality along with "deep deleting".