Do not suggest what you think Blizzard should do. Neither we nor Blizzard care about your great idea.
I think the design intent behind Guardian of Ancient Kings bodes well. I can see Holy Shock holding 3 unique utility for each spec.
For Ret, it could apply 200% damage as a dot or have a daze for PvP. For Prot, it is an obvious snap agro tool or could provide an 'intervene' type effect for allies. You get the idea and the same applies to Crusader Strike now that it is baseline. It also holds with Blizzard's design principle of not adding more spells just for the sake of more spells.