Don't see how this conflicts with the author's point. The author stated, "Giving an Easy Mode to the people who need or want it has no effect on the play experi

Don't see how this conflicts with the author's point. The author stated, "Giving an Easy Mode to the people who need or want it has no effect on the play experience of those who don't use it." However, in your example, they made Halo 3's hard mode easier. That's not the situation the author was referencing.