If you're building an MMORPG or Tabletop Games, you have to build a fun and balanced game while keeping it diverse. So, some "jobs" or classes will inevitably be better at some things than others, while having unique powers and weaknesses; hence, Wizards will be squishy and Warriors will have trouble outside of combat. So it's not unnatural or surprising when in Player Versus Player combat between support or non-combat oriented classes against pure combat classes, the more combat-oriented classes will win. This is balanced by the Inverse Law of Utility and Lethality; the support classes will usually be indispensable in the functioning of the wider game world or for difficult quests.