sfmedic, I don't think others are saying that avoidance is taught at handgun shooting skills classes, I think they are saying avoidance is taught at CHL, legal, and tactics oriented classes.
I know it was discussed in CWP/CHL classes I took in Florida and Missouri, and at Massad Ayoob's MAG-40. It was not discussed at the NRA basic pistol instructor's course, which is more about weapons safety and how things work, nor was it discussed in any of the handgun classes I received via the military.
So, the purpose of the class factors into things.
Edit: On a related note, I think every instructor who ever taught me a knife disarm said to avoid wherever possible, and to expect to get cut in a real encounter...