I consider Barry Stark an excellent instructor and coach. He has a whole series of videos on YouTube that I find very helpful. However he considers cue ball last a flaw. He states as much in this video on flaws.
https://youtu.be/gSDo2dJiGoo
He gets to cue ball last at around 5:45. I don’t find his explanation of why object ball last is better to be very compelling. He has obviously been involved debating this subject. He emphasizes that you need to have your stroke so grooved and have confidence you will strike the cue ball as intended without having to look at. I get that and agree that a student of Barry will get to that in short order. His justification of object ball last seems to boil down to; Because it is the right thing to do.
While striking the object ball correctly is the objective, striking the cue ball precisely is necessary to accomplish that. Barry teaches how to accomplish that. I find it easier to accomplish when I focus my attention on where and how I strike the cue ball.
Establishing a stable shooting platform and grooving the mechanics will allow a player to hit where they are aiming regardless of where they are looking. Check out Mark Williams no look shots.:thumbup: