Since I have been called out to take a swim in the aiming pool, I will wade into the shallow end only.
Those of my generation had very little to no resources available to us to learn this game, particularly aiming. I had transitioned from GB to contact point aiming, For the majority of play, the sight picture I see on the table will either click (or not) with my memories. When I am not freewheeling or having a hard day on the table, I supplement the shot pictures I see with SAM, as a double check. There are also other things I do depending upon the requirements of the shot. Like trying to play for those consistent angles (like half ball hits) that are very visual and predictable.
Basically I have learned from trial and error and used drill and practice even at a young age as a way fix those deficiencies. Have I fixed them all, hell no.
I also have been experimenting with coming in across the line of the shot which has given me a different perspective of the shot picture. I have been adding that to my PSR.
On my bucket list is a trip to see Stan to learn CTE - ProOne. I am the type that has to learn by doing....and questioning. I don't pick things up well from books / videos.
As far as I am concerned a player should experience a number of aiming methods. We all see the balls differently, our brains process this info differently. The aiming system that works for Tom, may not work for Dick or Harry.
Besides there is nothing wrong with being a student of the game, and having a variety of tools at your disposal.
Awesome. Now, I'd love to hear from the other instructors and better players on here; Scott Lee, Tony in MD, FranCrimi. Lou, Dan. Let's hear yours.