In short, documents that are riddled with items from the TFR list indicate that a
student has not engaged in the material or structure of the course.
The only way to improve revising skills is to practice revising. The TFR list
provides a starting point to do so.
The list is what it is. There are no curve
balls or bait-and-switch tactics. There is no question of whether I "like"
the way a given student writes. If you produce documents that contain items
from the TFR list, you haven't engaged in the course.
With that said, I acknowledge that the Harder to Spot items are somewhat
difficult to deal with, and so I allow some room for the learning curve related
to those items. However, the Easy to Spot items are just that,
so deal with them as you revise your documents.