Where it has value, I think, is giving people a reference for the number of important variables. Modern DSLRs are covered in controls and symbols and modes, etc. and I believe for a beginner it can be quite overwhelming. Having just these key factors in mind when shooting could plausibly give a beginner the right set of variables to focus on without being distracted by all the other fluff.
That being said, I absolutely agree that the only way to learn photography is to get out there and shoot.
>> the only way to learn photography is to get out there and shoot.
Mostly agree, but I see there as being two parts of photography.
The art, which is seeing, composing, etc. For that, you do have to just get out and shoot.
The craft, which is knowing what settings to use and when. You can learn this by trial and error by "just going out and shooting", but having someone teach you, reading about it, or using an app that demonstrates what happens with a settings change will not only save time, but make the time spent shooting that much more productive.
I think this applies to a lot more than photography. Directly, I have knowledge of how it applies to both dancing and music as well, especially jazz. You definitely have to get out there and do it, but you have to spend time deliberately refining your ear, and deliberately refining your technique.
For dancing, it's much the same, you need to get out there and do it. But there is also a lot of time spent deliberately refining your ear for the music, your feeling for the beat what position your body should be in and how a lead should feel. Each play into the other but if one is neglected, it's hard to progress.
That being said, I absolutely agree that the only way to learn photography is to get out there and shoot.