Coma is available in every battle, so it is here an option against you if you were to use your High Wizard, let us put you in a scenario against an Assassin Cross, one of the strongest classes in the entire game, you are getting attacked at a 195 ASPD rate, your Safety Walls will only last so-long for you that eventually either you will tire out or the enemy will, but in case that was to not happen, you would be under said circumstances of swift death since you will not have enough versatility to fight against the class.
Assassin Crosses can attack at 195 ASPD rates with 32k Attacks or more, you may use Energy Coat, but it will run out quick, you use GTB, you will receive full damage, if you use Usakoring you will be open to Coma ergo you will die.