Yeh, BUT the guy moves, you aim at the face and he moves, it too late for you to change direction midway. You might end up punching the forehead or side with solid bone.
What is so wrong punching poles like I do? I am not saying to punch hard, do it lightly like what I do will strengthen the knuckle tremendously. One cannot think punching heavy bag will strength knuckles. I punch heavy bags for decades, I stuffed the bags to make it harder already. Nothing can prepare you to punch a hard target like the head.
Like I said, I broke my knuckles wearing a bag glove with 1/4" padding when I break boards. It should be at least as padded like the skull. I broke it so bad it took a long time to heal. Believe me, you won't get the second punch in after you break your knuckle, it's very painful. The move sickening thing is when the knuckle break, it collapses, I could feel it collapsed. That in turn cushion the blow and make it less effective!!!
It's easy to say you punch correctly and you won't have problem. Situation is dynamic, you don't have time to have the right distance, the right position and timing. Anything goes wrong and there goes your knuckle. The guy is NOT going to stand there and let you get to the perfect position to punch!!!
Punching is one thing I have been doing for decades, at the time, I went to school 2 hours earlier and working on the heavy bag. I never stop for decades. Believe me, NOTHING can prepare you to punch something hard like the skull. That's why I started punching pole 20 years ago after I broke my knuckle.