How would Akuma or Sagat land their red focus combo though? For Akuma his best move into red focus is close fierce, for Sagat his best is the first hit of tiger knee. These moves are not good for fishing for EX red focus. Yun is a different story though, he can use far MP or cr. MK into shoulder safely and do it over and over until it hits or he dies. But if he confirms it he’s practically guaranteed 400+ damage either with another EX meter or either of his Ultras.
That’s what separates Yun and a few characters from everybody else. They can utilize the mechanic easily because they have a multi hit long range confirm from neutral that’s safe on block and doesn’t knockdown while most characters have to get in very close. Certain characters like Yun, Viper, Geif, Oni, and maybe others like Evil Ryu or Yang will utilize EX red focus really effectively and at different ranges while most of the cast will only use it from a very upclose confirm or as a punish.