I don't know the textbook definition of a A player. If I'm one, I'm a weak one, but still I have never cared for this drill. I've spent a few minutes here and there screwing around with this and it is definitely harder to do with draw.
I would much rather spend my time shooting very straight shots and getting the cue ball to stop on a dime (or follow straight into the pocket behind the object ball, or draw straight back). If you do that you should be able to tell if you are putting unintended english on the ball. I think just shooting the cue ball into the rail throws me off a bit and from my vantage point, I would rather spend my time actually potting a ball.
I guess it is cool and all, if you can hit the cue ball hard into the rail and come straight back and hit your cue tip. I suppose this proves that you're hitting the cue ball where you are intending but it doesn't prove that you can pocket a straight in shot with no english -- only pocketing a straight in shot with no english proves that. So why not practice that instead?
To answer your question - I doubt there are too many A players that spend much time with this. I bet most of them can do it though.