The OW/AOW etc. courses of today are designed for vacation/occasional divers, who are 90%** of divers, and this is perfectly fine. However, vacation divers do not have the time either the dedication to learn difficult techniques.
If you are so interested in mastering scuba diving techniques (and here I am not speaking only about propulsion), it means that you have a genuine curiosity and interest in this activity, which is cool! But it would help if you looked for different products. Specifically, some tech-oriented instructors/courses; scuba-board is full of suggestions in this regard; you just need to search
**This number comes from my fantasy; I have no idea of the real proportion, but I am rather sure it is a vast majority.