For Prot, sure; however, Prot's power is aberrant, though it's not incredibly powerful given how the ladder looks (i.e.: Prot Paladin are relatively rare and become rarer the higher rated you go). That said, we shouldn't be looking at this in terms of a Tank spec. vs. a DPS spec., we should be looking at it in terms of comparing DPS specs, which we already know that Warriors are significantly better than Ret Paladins in 2s, 3s, and RBGs. The reasons for this is because Ret's comparatively low mobility, reliance on CD stacking, and lack of defensive CDs (i.e.: reliance on DS). If Warriors wants buffs to one of their defensives they're obviously going to have to compensate by having another defensive weakened or removed, depending on what effect of Spell Reflect someone would want to last over the 5 second duration. The idea that because Paladin have bubble that means that any and every class should be able to have any form of immunity for any reason, regardless of whether their toolkit is already incredibly performant, does not fly.