> The point of centering an element horizontally is to make sure that the content you’re viewing is directly in front of you.

That's an awfully big assumption. For starters, you're assuming that the browser window itself is centered on the screen, and that the device is centered in front of the user.

I don't think this is the point of centering an element horizontally at all, and the result you have created here is not at all what I as a user want.