What will people in the future think when they look back at what people now deem educational or not educational? People in the past also felt certain they were right in their views about what constitutes a proper education.
Not everything we think is true is actually true, even if we feel 100% sure it definitely is true. No matter how strongly we feel that we are right about something, we might well nevertheless be mistaken. The subjective feeling of certainty is no guide at all to whether or not something is true. We can feel totally certain about something and yet be totally mistaken.