The thing is, "maxing" a game is a pretty meaningless concept because so many settings are ridiculously performance-intensive relative to the impact they have on image quality, and some settings, like anti-aliasing, are only needed in certain amounts at certain resolutions. But "maxing" a game is such a universally-recognized concept among PC gamers that it's hard to describe performance without using it. As game engines become more complex and scalable, this term is becoming harder and harder to define. No one needs to run GTA5 with 8X TXAA, 8x reflection MSAA, and 100% on every view distance/density/variety slider. But they still give you the option, because why wouldn't they? So it makes it difficult to define "maximum" quality because at a certain point, regardless of your computer's power, tradeoffs are necessary.