I think it's more the fact that people see diminishing returns and panic. A lot of people see it as a waste after a certain point which is a common misconception.
Now the problem with people is that they have to throw out that idea that it's useless. It's not. It just takes more to get a percent out of your skill. So instead of saying that there's no magical point where avoidance starts being horrible, you might want to rephrase that as "there is a point where it becomes increasingly harder to get avoidance up due to the fact that Blizzard ramps their numbers up passed a certain amount. Aka it takes 15 points to get to one level, then it takes 20, 25, etc etc etc.
Just a clarification I think would be in order so people don't confuse that the avoidance stat is 'useless after a number'

