@GoldGame
I mean have you tried fighting someone with only your legs? It's not easy. You have a harder time blocking, and you're limited to only one leg on the defense bc you kinda need one to stand with. Blocking your face is harder too bc they're kinda on the opposite side of your body from your legs. Your attacks become a bit more predictable bc they only need to keep an eye on your bottom half unless you can pull a nasty headbut or elbow which are all stupidly short in the range department. Also I mean, it's not like when you use your hands, you suddenly can't use your legs. you just have more ways to attack, block, and distract your opponent.
tldr, less ways to attack, harder to block with legs than arms, use both legs and arms at the same time