I would argue it is because they are lost in the vast sea of instructional technology choices. Most have not been shown the benefits to their students, or to themselves of learning new ways to do accomplish long held goals. I have found that selective use of computer technology has helped both student learning and improved my teaching in the U.S. History Survey. Most would agree that improving student learning is an admirable goal. Instructional Technology or IT can be used to help.
Every experienced teacher knows that students have very individualized learning styles.
Some are more verbal. Others do best with written work. A lot of students in the late twentieth century are visual learners. I have found multimedia materials in the classroom useful for reaching these various learning styles. But, it is also possible to have too much technology.