The DDO Developers' seem to be using a different definition of diversity...
Yes, I think they are thinking more on the lines of a 'variety' of different classes and builds. For example Multiclass or classes that wouldn't normally choose or Shadowdancer, or people finding themselves off-destiny and just wanting a stepping stone to another sphere or Density. Rather than focusing upon "unique play style", and Rogue archetype diversity. So it's looking like they were using the term in the loosest sense and not meaning Rogue play style. :-)
Whereas some of the players we asking specific questions about what helps to make Shadowdancer abilities more diverse and unique. For example: some of the responding players were asking for other than; increased SD melee power. They were asking for alteration to stealthy and manipulative deception like techniques, within this thread, subtle roguish tactical stuff, etc. Those questions weren't specifically answered - if I recall correctly.