I disagree. Utopia would hurt Guild Wars if anything. 2 other classes to try to balance :/.
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I think as long as they didn't introduce any new game mechanics, it wouldn't have been too hard. New mechanics are mostly what made expansion classes so difficult to balance. Ritualist spirits. Shadow stepping. Chants.
Chronomancer, for example. Time slowing spells? Hexes that slow enemy move/attack speed. Old mechanic, counters are already there, easy to balance. Speeding up? Enchantment that boosts allies.