There definately good reasons to allow making judgement calls, but I wouldnt be complaining if that all they use that freedom for.
Most of the time if you asked for some exception they would allow you to drop the class without issue. So they wont break the rubric to make the class easier, but they will to make the class harder. And thats what I take issue with.
On one of my finals the professor said "you all did too well on the midterm, so I changed the final to be on meaningless details in the reading to test your comprehension and only your final grades matter" so we could fail despite learing everything we set out to learn.
I had an engineering ethics professor tell me I could I turn in the first assignment late on the second day of class, but after the final she said my grade was entirely dependant on the first assignment and it was late so I got zero points and failed the class. They have a quota of students to fail and they just pick people to fail and come up with bullshit after. They use their unchecked liberties to screw the students out of their money and nothing more in my experience.
You might DM too much because you think youre the master of the universe. Im assuming you were homeschooled by flatearthers, and thats cool you had a good experiance but that doesnt mean other people didnt have bad ones.