Older trinity class systems had no damage dealers. It was Tanker/Healer/Controler.Holy trinity = Tank/Healer/Damage <----- This holy trinity is very narrow in design, Leads to tank and spank, Damage dealers are only told what to attack and do nothing else, Healers pay attention to health bars and not the actual encounters, Tanks stand their letting things hit them.
You are way off base on a number of terms and design theory as well. But that's fine, I am not that bothered by it. But felt it was worth pointing out for your future correction/self education.