What people usually want from a proxy list
Most people are not looking for a magic anonymous connection. They are trying to test how a site behaves from another network, confirm that an IP really changes, or find a disposable endpoint for a narrow troubleshooting task.
That is why this page keeps the filters simple: country, HTTPS support, anonymity label, and recent check time. It is enough to narrow the list quickly without pretending that a public proxy is stable or trustworthy.