Well, I have to disagree. If CTE perceptions lines on the OB are not easier to see than contact points, why do it? AND, in my lesson yesterday, we spent about an hour on "forced follow" shape. There are many, many places on the pool table where the only position can be found through "forced follow" and not what most of you have seen, the OB sitting close to the pocket and you want to stay on the end rail. Either clusters or the perfect angle must be gained this forced follow way. I'm pretty damned sure very few of you have ever seen this but my instructor can do it and teach it. AND, the most important thing to know is the portion of the pocket for the OB from an angle. I may do a video where the CB can be positioned straight in for the 9 ball on the spot or on down the table for a shot down there. Anyway, the 1,2,3,4,5 of the pocket makes all the difference... a HUGE difference. So... if your aiming system has your ball going into the center, how can you do this stuff?.... you've got to come off of it and shoot contact to contact points to fathom the different portions of the pocket. If you've seen what I've seen, you'll quickly realize "no aiming system" except contact can do it.
Any method of pocketing balls can become as automatic as flipping on a light switch. It takes experience to reach that level. Using traditional aiming methods like gb and contact points are surely proven paths to getting there. But it's also a long and winding path that requires a lot of table time and dedication, which many players are not able to invest.
That's where an aiming system can help reduce that investment, straightening and shortening that long road to improvement. Now, if the system you choose to adopt does not lesson your invested time and effort, then you may as well stick to the old-school traditional aiming methods. Why spend several years developing enough experience to precisely use a system if less effort would be required to precisely use gb or contact points?