Shaman: oil and blacksmithing stones

Why shamans can’t use alchemy oils and sharpening stones with their weapon enchants? Rogues can use both poisons with oils/stones. Because of this alchemy potions which have increased affect while oil is on weapon aren’t working. Any recompensation for it?

I’ve noticed this too but as Flametongue is just really cosmetic for Elemental it I just use the Shadowcare too, it’s definitely a disadvantage for Enhancement though.

elemental/ resto maybe yes flametongue isn’t useful, but for enh choosing between oil and weapon enchants is just wrong.