Not necessarily different shaped mouths, but there are different ways of eating and different ways of using a fork depending on your sex, hand size, culture, daily caloric intake etc.
You can't make "the best fork" unless you also want to enforce your way of eating upon people who are going to use your fork. You can, however, try to make the best fork for the largest group of people and get people to become loyal to your brand. After they become loyal to you, you will feel more and more power to enforce your ways of doing things and as a result your products will get "even better" in their eyes. This is what most companies are trying. But only Apple is exceptionally good at this. Hence, I think this whole article serves the purpose of subconsciously justifying the author's brand loyalty to Apple.
You can't make "the best fork" unless you also want to enforce your way of eating upon people who are going to use your fork. You can, however, try to make the best fork for the largest group of people and get people to become loyal to your brand. After they become loyal to you, you will feel more and more power to enforce your ways of doing things and as a result your products will get "even better" in their eyes. This is what most companies are trying. But only Apple is exceptionally good at this. Hence, I think this whole article serves the purpose of subconsciously justifying the author's brand loyalty to Apple.