Perhaps if you're going for simplicity or something then that might be an ok idea, but he mentions those three because they are more modern or important additio

Perhaps if you're going for simplicity or something then that might be an ok idea, but he mentions those three because they are more modern or important additions to the Quake model. He is of course very aware of their Quake heritage, at the end of this article he credits John Carmack (in an indirect way). I recommend reading the rest of Gaffer's articles before doing anything, it will give you a basis that's needed to understand why Quake does what it does.