Until there's some sort of evidence that the roids improve hand-eye coordination I guess I'll be in his small little corner.
The hand-eye coordination was there to begin with. Steroids merely makes him stronger, allowing the ball to go farther when hit.
Add steroids to me, you'd get a guy who still couldn't make the major leagues, but I'd be stronger. I could bench press more, I would become bigger.
Add them to a major leaguer, and they simply become stronger as well, which is a little different scenario, because unlike me, a major leaguer can already hit a baseball. Now the ball goes a lot further and balls that would have been long fly outs are homeruns.
No one is arguing that steroids is improving hand-eye coordination, so your premise seems a bit flawed.