-ed tech exists, by definition, on the greatest distraction machine heretofore known to humankind
-ed tech lets the tech do the grading, removing the ed from the loop. It abstracts away the teacher's mental model of my student's mind.
-ed tech is overwhelmingly short-response or multiple choice; this measures only the most basic forms of learning.
-there is rarely a physical artifact, making lessons and learning far more ephemeral. Often, I cant review previously-submitted work to see where my children have gone astray.
-ed tech has completely removed the physical aspects of education. Writing notes is better than typing notes is better than merely listening to a lecture, on a retention basis. Rather than actually submerge an object in a graduated cylinder of water to calculate its volume via displacement, its now a shitty online "experiment"
I could go on and on, and perhaps later I will in subsequent comments.