I agree with basically everything you wrote, and I recommend Evan Kindley’s social history of questionnaires and other forms (including standardized intelligence tests), which has a whole section on Galton and other eugenicists: Questionnaire, by Evan Kindley – n+1 Shop
By far, the thing I am the least comfortable about / most frustrated with re: our testing decision — a local institutional choice based on 50 years of research in the context of a highly specific education — is the way it has been taken as a universal statement re: Testing Is Always Good At Everything And We Should Not Be Worried About It. That’s why in the original blog post, we had 200% text in footnotes trying to explain the research. But that’s not what gets circulated on Twitter (or CollegeConfidential).