A lighthouse keeper notices a particular flock of seabirds arrive a week before every storm. He doesn't know why. He only knows that when the birds arrive, ships should already be in harbour. The fishermen who follow him stop losing boats. The ones who say 'birds aren't weather data' keep losing them.
The lesson
Engineering acceleration is the seabird flock. It doesn't prove the storm. It precedes it reliably enough that ignoring it is the expensive choice.
Why this matters for Developer-Investors: The parables aren’t metaphors for branding. They’re the shape of the underlying claim. If you find yourself nodding at this story, the rest of the methodology will land. If you think the story is wrong, the product probably is too — and that’s honest.