Because it would be undoubtably broken. Sub would become the stupidest character in the game, because he could sit behind clone and throw ice all day, slowly chipping his opponent to death. An opponent wouldnt dare try to trade due to the fact that iceblast also builds meter very well, so ice beam would always be a threat, plus he could slide anything with the new slide buff, so every opponent would sadly have to watch their life slowly disapear. Except freddy.Lol.