What I mean is that in theory in the idealised setting, certain things should work. In reality, the outcome of certain things varies so much.

To elucidate my point, I will provide an example.

A cold read can be done and this is a good conversation starter. However, if a wimpy non-confident dude uses it and thinks it doesn't work, he will blame the theory behind it. The real cause of it not working is a variety of factors that contribute to how that guy conveys himself overall (body language, smiling, vocal tonality, way he's dressed, eye contact etc).

Keep in mind that winning in the park is the goal and not winning in 2k19 when learning pickup theory.