This would be way prevalent with the object ball watchers. With the less common cueball watchers, accuracy is a function of having eyes on the tip strike.
Not if you have an issue pushing the cue straight. Does not matter much what you are looking at, it's how you are moving the cue. Knowing how to aim and how to hit is the easy part, the hard part is actually hitting the right spot on the cueball and sending it to the right spot on the object ball. We can all explain to any new player how to aim using the contact point on the object ball and what spin does and general ideas about cueball control and how to develop good mechanics of lining up on the shot and stroke in maybe 30 minutes. It will take them the better part of the rest of their lives to try to master doing it LOL That execution part is where we need to remove all possible errors, which we do with mechanics and to an extent the shaft technology with lower deflection to keep the variable of that as small as possible, which is another pandoras box to open hehe.