How do you understand subs should be used? Do you see any logic behind it?
Here’s what I think about it:
First, you need to know your predominant psychological archetype, your skills, gifts, predilections and preferences then you need to know what you want and “the right order” of achieving those goals. First, you run a healing stack that clears out all the obstacles you may encounter on the way to developing your predominant archetype and on the way to achieving what you want (or want to become). The Dragon is an obvious answer here.
In my case, the Alchemist is my archetype so now I’m doing the Dragon and switching to the Alchemist. Then I want to build my wealth around my archetype, gifts, skills and preferences so I’ll be stacking the Alchemist with RM (employing your gifts and natural creativity). And finally, I shall build a custom based on both (the Alchemist and RM) and Stark plus some wealth custom: