A major part of success in fighting is controlling the distance. I need to be in a range where I can effectively attack and my opponent can not. That does not necessarily mean I need to be far away. Especially in a grappling context, if I can not touch my adversary I cannot control them. One of the things I see, especially in no gi, is abandoning grips. whether we have a gi or not, sound fundamental Jiu Jitsu begins with four points of contact. If we loose our points of contact, we no longer have control. If we no longer have control, we are behind. As Saulo Ribeiro says “if you’re late you muscle, if you muscle, you get tired, if you get tired you die”. It may not be that severe, however being in control of the distance in any combat situation will make your life easier.