After looking back and forth, I prefer to switch my vision to the object ball for the last time, just before I start my final backstroke. Then I keep my eyes locked on the object ball from that point on. I don't like moving my eyes at any time during that final back and forth motion. This frees my mind up to concentrate on executing the shot, which is what I want at that point.
Shotmaking, (speed and CB direction included) is indeed a leap of faith; why it's possible to look away and still shoot the intended shot. You do whatever you do, set, and forget. After years of intermittently wondering about it, I come to the conclusion that the reason for looking at the object ball is to judge the CB; the hit, the exit direction, the landing. The exception being, jacked up where you stare down the CB to avoid masse-ing it. Obviously if you use rifle aim, the CB is in your sights regardless.
As to the relevance of actual vs non actual instuctors discussed elsewhere, only a handful are able to perform at today's standards; (actual pool ? lol) some by diligent work with a handful of gurus, some by simply doing it.
The rest, by definition, are dogs. So much for one's personal impact on the genre.