The Overlooked.

It should be mandatory for each belt test (if that is your thing) to include the study of local laws.
Most importantly, self defense laws, carrying laws, trespassing laws, heck, one could make it a habit to study and re-study whatever portion of the law catches their attention.

I have learned a lot even about laws governing protection of children, what constitutes child abuse, labor laws, but I am far from an expert. It is always good to be informed, however, because what we are given is a responsibility to be informed, uninformed users are a danger to themselves and everyone else, otherwise they are rendered impotent BECAUSE they are uninformed.
Survival of the fittest, in this instance the fittest is the most informed and most prepared.

It should also be mandatory to study one's surroundings, which is often neglected in just about every aspect of training.
Where are the exits? What is the terrain like? Positioning is very important. If you are sleeping on a couch next to the front door and someone busts in you end up jumping up facing AWAY from the assailant and have to readjust.
If you are facing the door with your head being the farthest from it you are in prime position, not only because you can see what is going on, but they have to actually work their way to you in dark and unfamiliar territory, you have homefield advantage.

This is all beating a dead horse, but so many drills are designed specifically to deal with combat on the level of a contest, as has been pointed out by so many others in so many different ways.
This is alright for that particular approach, and it is good to cover as many bases as you can, or at least as many of those bases that are relevent to your specific needs.
Just some food for thought.