My opinion its just stacking corrosion resistance and is a "nice" to have. It may appeal to people who may be out for weeks on end and don't want to or cant regularly oil the gun. Maybe to people who just want to add another layer of protection to their investment (would protect well against blood which can easily discolour stainless). Or they just want the minimum amount of maintenance possible. Its certainly a want not a need, but hey, you can double up on corrosion resistance if you so desire and have the ultimate wilderness rifle if you have the budget for it.
There are many guns out there nowadays that are cerakoted. It adheres very well to the steel below and is very hard, about 1/4 the hardness of diamond - so is some hard & wear resistant stuff. Im sure there are many articles about the pros and cons that would have some good technical info if you were interested.
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