This is absolutely correct. Boxers can be beasts but I never liked the fact that they specifically train to block incoming force by hiding behind their hands and arms. What if they're facing someone with a knife? They still have their highly effective evasive maneuvers, but to paraphrase what you said, what's going to come out in a stressful situation are the things they repeated thousands of times during training. Those arms are bound to come up to block...at least that's my thinking.