The corner stone of the chute boxe strategy, was the "penalty kick" and "stomp kick", it really is a game changer when it's there and when it's not. It's not exactly what characterize the chute boxe but without it a critical piece is missing in the chute boxe style which then "just" turns into muay thai and jiujitsu, two styles coexisting with each others instead of one unified style/strategy It is allowed in muay thai to hit your opponent in the face with a low kick, as long as the low kick is in the flow of a combination and your opponent hasn't completely reached the ground, while he's falling typically https://youtu.be/KH2RXZr7R-w?t=85 The penalty/stomp kicks only make more sense in the end, of course the low kick has always been an option as a finishing move in the context of a street fight situation, the stomp kick is also found in karate it's not something new it's a rather old technique actually that only got popularized with wanderlei silva https://youtu.be/ZsIhbtmEe1Y?t=60