(Aside: my local library blocks everything but 80 and 443 outbound. I complained to the director; he cited "security". I tried explaining that I knew something about Internet security; he told me that the firm that had installed the system had "done most of the libraries in the county". I translate that as "most of the libraries in the county have broken security policies".)
Among the many wonderful things Internet has created in the past 2+ decades, it gave birth to a countless number of "Internet Experts" ... Perhaps a more organized/focused discussion may help kick off an IETF WG to identify and document the problems/needs/requirements and an informational RFC/BCP can be produced, then the "experts" will know that for better security and reliability they don't need to mutilate internet protocols or dismember the Internet. My .02 Jorge