A teacher can understand what problem the child is having, and explain how to fix the problem based on past experiences. A computer is programmed to share information and to test understanding. However, if a child doesn't understand something, all the robot can do is repeat himself until the child understands. This comparison of how robots help kids who do not understand vs. How a teacher does it, makes it obvious that the teacher is superior at educating children.
Teachers are better than computers because teachers actually have emotions and the computers and robots don't actually have emotions.If a kid says that his stomach hurts then the robot would probably say that they do not understand or say to deal with it and yet teachers actually wouldn't do that.
I have sat through many classes in public school where the majority of the class consisted of the teacher whining about their paycheck not being the same as someone with a graduate degree. I have even had teachers attempt to influence students of voting age to go vote on legislation to raise their salaries, offering "extra credit" and whatnot.
I have had condescending teachers, teachers with biases, teachers who thought it was funny when their students' grades dropped.
I honestly had not had a good teacher since the 6th grade up until my senior year (the only remarkable teacher I can mention is my AP government teacher). My professors in college far surpassed the narcissistic, apathetic teachers I was forced to spend semesters, or even years with in high school.
I have taken online courses that have actually stabilized my understanding on the subject better and increased my retention. In classrooms in public school, I found I was often just regurgitating information that the teacher wanted to hear without really comprehending it.