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And weren't there different tactics in the third game? What makes certain battles problematic? Is it more difficult? I wouldn't say so.
The lack of standardization is a good thing, though. It's the only thing I liked about the fourth game. It's cool to assemble a diverse party, BUT many classes are clearly weaker than others. For example, the Battle Mage has a bonus to melee attacks and ice bolts, while the Fire Mage has bonuses to ALL Chaos magic. I have a controversial opinion, but this isn't a good thing.