FIrst, I'd like to say theres nothing wrong the attacker doing the traditional punch to up, stance and all, in a way that if the defender doesnt move theyre gonna get hurt. Plenty of MA schools do this and have students who are capable of Defending themselves because of that danger. Idk how many times I lost focus at just the wrong moment and got my nose or mouth busted.
But, the problem I've seen with American Kenpo here in this thread and in others, is that the defender is doing wayyyyy too much. after one or two moves, if you havent put the guy down he's just gonna attack again. We teach all gold belts and up (gold is where students are expected to have their own SD moves) that 2-3 is the most they should be doing, with 3 being the "It's a good one for belt test to showcase moves, but understand it's too much for SD" number. Anymore, and you're probably gonna get clocked trying to showoff
I dont know if these videos are a poor representation, or what. I've personally never been able to train with a Kenpo student as there isnt one in my area. But from what I have seen, thats big issue I have.