Schools, the institutions we have adopted for teaching, are a rather recent human invention, and may not be the best. Scholars have documented how teaching occurs in societies other than school and found some similarities; western schools have largely ignored that knowledge.
When using modern media, one cannot assume any editorial oversight. Hucksters, radicals, rascals, and idiots can all create content for the web and the content created by those groups appears in the same search engine results as those of professionals, experts, and authorities.
It may seem unnecessary to state it, but schools are places where children are present. Lots of children. Children who reflect the social, racial, ethnic, and other characteristics of the local population.
The most successful forms of intelligence that humans have discovered appears to be the symbiosis (although the biology student in me recoils at the use of the term) of humans and computers.
Computers can easily do the things that are hard for humans, and the things easy for humans are hard for computers. This is sometimes called Moravec’s paradox.
Faculty often have a most favored pedagogy. it may not be anyone else's favorite, but that does not dissuade them from using it... over and over... and over.