I think, sometimes, it is easy to forget things haven't always been the way they are in the present. When one is young so many experiences are new that it is difficult to see very far into the past. It takes aging, perhaps middle age, to truly begin to understand how quickly things change; and just how much change is afoot.
In the United States, where there are so many different beliefs and organizations, it is impossible for a lot of information to be known at once, and the pace of technology today makes the knowing even that much more impossible. I think that's how public education gets behind; there is so much information today that vetting it now takes many years instead of a single year to do so.
When I worked in the field of archaeology, it took sometimes many years for a report to be published. The larger the study, the longer it took. That meant that field archaeologists were sometimes many years ahead of those who only had access to published information.
As a writer, I realize if I don't self-publish, readers may be years behind where I am now. But there is a process a book must go through (whether traditionally published or self-published) to make it as good a work as possible. Not many people want to purchase a book full of errors. I think about the time involved in the process of making movies that are made from screenplays adapted from books. If we the audience never read the book, what seems futuristic in the movie may have been in print for 20 or 30 years, maybe more in some cases.
This doesn't necessarily mean there are many who are behind. What it does mean, though, is that if we aren't continually educating ourselves then we are behind, or soon will be. As I said, it is easy to forget things haven't always been the way they are in the present. Never stop learning.