Plus shadow dancers can 'summon a shadow' to use to hide in. Won't see many rogues trying that one I bet.
My personal view is both are going to roleplay using the shadows. Fact is, if you need to be hidden, a dark place is a good idea to be in.
So, how does a shifter in kobold shape use HIPS? It is very effective tactically I might add. The ability to evade creatures in mele, and then come back and sneak attack them makes for a powerful flanker.