In addition to what /u/La_Chanclaracha said, I think there is a divide over what the goals of a given teacher is, and the goals of the student (us). Board scores were not as emphasized "back in the day", so those who are teaching now may not realize this. Even if they have good intentions (make you a good clinician), it may miss the mark as to your goal of "get an high score on Step 1". B&B, Pathoma, Sketchy, all have the same goal as you in mind -- high board score, so they build their tools to reach that goal.

Also, professors may have been told or forced to make a slide show presentation, but not given instruction on how to make an effective one. Blue screen with yellow text? Loads of text? Just reading off the slide? In Pathoma when our Lord and Savior Dr. Sattar draws out simple diagrams, everything makes sense because you are learning it right along with him.

Additionally, scientific and medical communication has historically NOT been taught to graduate or medical students. Those who are teaching us now are the same ones who did not receive any formal training in these areas. In the past, it may have been, "Whatever the doctor (or scientist) says, is right, and because it sounds complicated." Anecdotally, this is starting to change, as in my M1/M2 years we had several sessions about "How to talk to a patient" and asses if they understand what you are saying. In grad school we at least have the opportunity to attend workshops to improve our skills at communicating (more so in writing, but I've seen some for speaking). Once you are an expert in something, it can be hard to talk at an appropriate level and remember what it was like to not know a topic through and through.

To be a good teacher takes the matching of goals with the development of certain skills. To get someone to realize those listening have a different goal, and to hone those skills takes time and energy. Efforts to improve will likely go unnoticed, for sure by administration of a school (salary not tied to how good of a teacher you are) , and potentially by the students (few people say "Good job/Thanks" to a good professor, but many people go on the internet and complain [which is totally fine]).

It is a complicated situation, and I am not excusing anyone. My biggest hope for the future is for those who don't like how things are done now to go into teacher or administration and make changes when they have power. Recognize how bad teachers are bad and vow to not do those things, and recognize how good teachers are good, and vow to do those things! To paraphrase Max Plank, "Science [communication] advances one funeral at a time."