Full dispel is an archaic mechanic that does not belong in the game.
It was fine in 2005 when all we had was protect/shell/berserk but now every single job has too many MANDATORY buffs they're balanced around having to actually be viable/capable of contributing.

This months ambu is a perfect example, due to the full dispel from the soulflayer no dd jobs not ranger/cor/summoner are worth bringing on the highest difficulty because they lose over 50% of their damage from not having their own self buffs up.