The fundamentals-to-advanced ladder personalizes by depth. Role tracks personalize by shape: the admin certification, the practitioner certification, the executive briefing track.
Role-based credentials let one account hold many, which raises certified density, gives each persona a path that respects their actual job, and multiplies the surfaces Stage 03 can activate.
Depth × shape
Level tracks answer “how much do they know?”; role tracks answer “what job do they do with it?” Personalization needs both axes.