Many people prob don't remember this, but prior to the 2.0 launch, Cleric Stance was WHM only. It was a relic from 1.0 and was never even considered into the x-class system. It was only after a ton of SCH players bitched they couldn't DPS as well as WHM that it was changed.

So, in essence, like Enhanced Protect and Graniteskin, Cleric Stance was another item of identity that WHM gave up at some point. In fact, WHM has given up more skills and traits for the sake of balance than any other job so far. Food for thought :P