Narrative architecture is the small set of claims an organization is willing to defend over years, and the supporting evidence — products shipped, customers served, positions taken — that makes those claims unignorable.
Once the architecture is in place, channel selection becomes obvious. Every interview, every keynote, every product launch is an opportunity to reinforce one of a few load-bearing ideas, not a one-off creative brief.
Brands with strong architecture do not have to remind the market who they are. The market does it for them.