They don't have to. They can live without. The current cross discipline system needs to be scrapped. What we have now needs to be added to all jobs that need them and make room for actual cross class abilities. MCH is the biggest offender here. If CC is needed to optimize a job they should have those skills integrated into their main kit.
A Provoke skill should be on all tanks period. They shouldn't automatically be forced to Cross Class Gladiator just for Provoke.
It defeats the purpose of cross class and gives you no illusion of choice. Too restricted. Too controlled. No diversity.
Either scrap the current system or allow players to use traited CC skills if they have reached the level of the other class required for them.
If you are afraid of stepping on ants you won't be able to walk.
