If you're focusing on the CB you can see what your stroke is doing if you're paying attention. If your stroke is bad, looking at CB, OB or anything last isn't the issue. Fix the bleeding and your game will benefit. If you're into pool, but not into it enough to fix a terrible stroke it literally doesn't matter what you're looking at. Enjoy league night, socializing, and have a few drinks.
If you're serious about pool and would miss due to stroke then that's what you should be working on.
If some of the pros are focusing on tip placement when pulling the trigger, it has nothing to do with consistency or somehow reigning their stroke in. It's hitting the microdot. The game can be played either way. Thankfully if we're off a bit the ball usually still goes. This is about perfection. You can take a general approach or you can pinpoint. The OB isn't moving either way. Once it's sighted it all becomes execution and where you hit the CB. Focusing on the CB is a leap of faith, but one that pays dividends.