The logistics behind keeping track of 100+ students a trimester can become daunting. Most tools available to teachers are wanton.
Then throw in classes with 600+ students requiring multiple teachers. Trying to align fairness (rubrics), plagiarism (tools like Turn-it-in) and the uniqueness of teaching style is difficult.
We'll, I think it is more about teachers being overloaded with the minutiae of data that causes them to lose focus of the bigger picture (education). Actually, in my opinion, education has lost focus on the bigger picture of education and may have never really had it.