Teaching as a career basically doesn't exist anymore outside of schools for children. It is not that teachers are using automated tools, but students are using automated teachers instead of hiring human teachers. When was the last time you hired a human teacher instead of consulting an automated teacher when you wanted/needed to learn something new?
Like I said before, we don't even recognize the existence of general teachers anymore, with the word under typical use now only referring to those who work at schools for children.
Books provide a primitive form of automated teaching, although we've expanded on the concept considerably since the advent of the book.
You have not heard of automated teaching as a thing because we invent names for automation. The automated kitchen servant isn't called an automated kitchen servant, it's called a dishwasher (among others).
Likewise, automated teachers are not called automated teachers. They are given names, depending on the teaching method at play. Automated teacher is used here as a generalization as the specific automation is immaterial.
