You have no idea what you're talking about. I train, and so does the amateur fighter that was in agreement with me.
Did you even read what I said?
Meaning that it's not at the very end of your punch, but right before. Meaning that you still have a few inches to travel. It's called kinetic linking, the energy from all the momentum in your body travels towards your fist, and is transferred at the end of your punch; if you're too close, then you'll end up pushing your target instead of snapping into it as you're supposed to.
The way you can tell if you're doing it correctly is when you're working a heavy bag, if it's moving all over the place then you're pushing it too much, and don't have enough snap.