A deck is a record, not a system
A hundred-page strategy deck is a record of a conversation you are no longer in. It captures conclusions but not the reasoning, and it assumes the reader was in the room.
Six months later the people who were in the room have moved on, and what remains is a PDF that nobody can act on without an interpreter.
Strategy has to survive contact with a deadline
The real test of a positioning is whether a writer under time pressure can use it at four in the afternoon. If it requires re-reading forty slides, it will be ignored, and the writer will fall back on whatever the competitor said.
That is how brands drift. Not through a bad decision, but through a thousand small defaults made by people who did not have the strategy within reach.
What to ship instead
Ship the decisions, not the journey. One page of positioning. A message hierarchy that fits on a screen. A voice guide written as before-and-after examples rather than adjectives — "direct" means nothing to a writer, but a rewritten paragraph does.
Then put it where the work happens: in the CMS, in the brief template, in the prompt library. Strategy that lives in a shared drive is strategy you have already lost.