I've been asked a few times to put together a filmed video showing fixes for common stroke errors. Yes, this could be a good idea, but it could also be dangerous since your stroke is an extremely personal thing. If this were to be done, I would want it to be a collaboration with a very high level player formatted as a professional video through OB Cues, and would look a bit better than my animated video I made posted on youtube
https://www.youtube.com/watch?v=wP9M_fZPNeE Others have suggested that we embed video clips and animations right into the app, which I think is a great idea.
Think of it this way. In billiards, you need to learn many different skills that are applied simultaneously in order to play the game consistently and effectively. But you can't learn them all at once, and a lot of the time you don't even know what the problem is. It can be very frustrating. The DigiCue at least helps to give you something to blame, so that you aren't chasing your tail on a plateau for your pool career. It identifies a symptom.
You absolutely can fix issues that the DigiCue identifies without an instructor. I did... it took me lots of trials of different things to try, but the DigiCue kept me on the right track until they were permanently fixed. This does work, and it does take a bit of practice and table time. We can't all get access to truely good instructors. Best example is that I was getting pain in my bridge arm rotator cuff after playing for a while, and also my Finish score on the Digicue would suffer when my shoulder started to hurt. As it turns out, I was still shooting with my stroke shoulder way more than I thought, and when I would get tired my shoulder timing would fall off and my body would roll its weight onto my bridge arm. I video-ed my self and also payed very close attention to what was happening. I fixed this with a more closed stance than what I've been using, and experimented with what made me physically more comfortable.
You can also take what you've learned from the DigiCue and ask an instructor or high level player. I've done this too. For example, when playing billiards, Mazin Shooni, Hugo Patino and Florian Kohler all told me on separate occasions to use my wrist and push through the ball more so then when playing pool. It is quite a different feeling. The follow through parameter on the DigiCue tracks this, but I don't think I would have mentally linked it to my wrist as quickly as if those guys verified me on it. This further helped fix my rotator cuff issue and now there is no pain and I have a lot more stroke power in both pool and billiards. Another example in pool, is that when playing with Mike Dechaine years ago, he said "I can smell wood burning". What he meant is that I was thinking about the technical aspects of my stroke way too much while I was shooting. He suggested that it needs to be an organic process when you are playing, and you need to identify a comfortable routine to consciously focus on when shooting. This was a mental thing that helped a lot with consistency, and my DigiCue performance went up.
Now, I feel that my technical aspects of the game are much better, and what I am lacking is the fortification in strength of my "mental simulator" of exactly where every ball is going to go on the table, under pressure of competition. I can play great by myself, but pressure affects me a bit because I rush. One pocket is absolutely great for this, but the better solution is to compete much more than I am. I can't find time right now to play in a lot of tournaments so I can't work on this, but that is OK because I know what to blame.
The point of all of this, is that the DigiCue can help "guide" you through all of the areas of improvement in your execution, instead of just hitting millions of balls and hoping everything falls into place someday. I think that having a DigiCue video for you to reference, players for you to talk to, instructors for you to visit, forums for you to post videos, and people to ask questions too, finding table time by yourself to experiment, and having many different resources available are all important things to do.
So I guess to answer your question it would be my analysis done frame by frame with an app. Nobody on earth can see the small deviations I am talking about in real time. The differences between a perfect stroke and a near perfect one are apparent in how the balls move on the table if you know what you are looking at, though.