I am going to look at a couple of the things you wrote here and make a great leap to a conclusion about the shop with which you are working that may be unwarranted. It really doesn't matter if I am wrong, though, because I am really talking about a big idea rather than making statements about any specific shop. If I am wrong about that shop, please look at this as if I am talking about a hypothetical situation instead.
Here are two comments you made:
There are a lot of us out there who think that sometimes people get passed through the open water diver course when they shouldn't. I know that the shop I work for doesn't pass people just because they paid.
You are an instructor, I'm only a divemaster in training. I KNOW you have seen people quit during the confined water sessions. I've seen at least 4 or 5 people just quit, and get out of the pool and never come back. That's all this is trying to prevent.
In my career as first a DM, then an AI, then an OWSI, then a MSDT, I have never seen a single person do what you say you have seen 4 or 5 people do while you are just beginning your DM training. I have had people not complete the confined water portion of the class, but that came after a lot of extra training, counseling, and soul-searching. The closest I came to what you described was a 69 year old man who was so enfeebled by both age, medications, and previous operations that his doctor must have been out of his mind when he signed the medical release form. When we was struggling with even the most basic stuff (he did pass the swim test) and causing incredible delays for the rest of the class, I took him aside and suggested he take the class privately instead of with a group so he could get more attention. He wisely decided instead that it was all too much for him.
I once worked with two high-functioning autistic students who struggled. It took many sessions before one was actually OW certified. We only took the other to the Scuba Diver level, because we believed he would always need to dive with a professional.
In the general field of education, we are moving towards a concept called either
standards-based or
mastery learning. In traditional education, a student studies a concept for a certain amount of time, then the instructor passes judgment. Time is the constant, and learning is the variable. The instructor uses an approach called "my teaching style," and it is up to the student to adjust to it to become successful. In mastery learning, learning is the constant, and time is the variable. The instructor does not have a teaching style; rather, he or she uses whatever approach is best able to meet the student's learning needs--the instructor adapts to the needs of the student. If a student is not succeeding, the skilled instructor makes the appropriate intervention to help the student succeed.
Although mastery learning is only beginning to make inroads into general education (after several decades of reformers like me trying), it is supposed to have been the norm with a number of scuba agencies, including PADI, for quite some time. A scuba shop that embraces this vision does not pass students "just because they paid." The shop says instead, "Because you paid, we will use our instructional expertise to get you to meet the required standards, even if you are struggling to begin with." A shop like that does not have students routinely getting out of the pool and quitting during confined water classes.
Not long ago, I was assigned a private session with a young lady who had started with our shop but moved before she really go into it. She tried to finish with a shop in her new location, but after a miserable failure, she drive hours to finish up with us. She described the other shop's classes, and it included a collection of outmoded instructional methods and attitudes, included yanking off students' masks and shutting off their air without warning. Students who struggled with skills were "motivated" through belittlement. She did indeed walk out and not come back.
When I worked with her, she had significant problems in a couple of skills (especially mask clearing), but we got through them, and she did a gret job on her OW dives. I got a a very nice email from her a few months later in which she described the great time she had had on her first dive vacation.
Weak instructors take pride in the number of students who fail to meet their high standards. They blame their high failure rates on students not being properly prepared before they take the class or not working hard enough while they are in the class. They don't look to themselves as a part of the problem.
Excellent instructors take pride in the way they were able to meet the needs of challenging students and get them to meet the same high standards.
As you do your DM training, take an objective look at your shop and ask which of the above best describes them. If you want to be a great instuctor some day, that path will start with great Mentors showing you the way.