Guitar players don't put english on the strings, nor football players the football. Even small differences in where the tip strikes the cue ball make a difference in how it reacts at impact and after.
I can't imagine not looking at the cue ball at all?
Imagine each string as english....you have to pick certain strings even when strumming or you will get a small difference in sound. When I strike the cue ball I am looking at the object ball, not the cue ball. I know where the cue is going to strike the cue ball so I focus on the object ball and where I am going to hit it. I don't play too bad either. :wink: