I would argue that point. Jif and Skippy taste like crap. I buy the stuff you have to stir, then throw it in the fridge. It stays stirred just fine when it's cold.
I dunno; again, to each his own, and if one likes "natural" peanut butter, more power to him. We're not primitives, after all, and can tolerate differences in taste.
I suppose it's a matter of how one masticates peanut butter.
I always found "natural" peanut butter sticks to the roof of this mouth, and it takes a concrete-scraper to get it off. Neither Skippy nor Jif do that, at least to me.