Henry said:
Please pardon my lack of understanding, but how is this different other than in semantics? It is still harder to be a preserver than a defiler. The only difference is that defilers are the baseline instead of being above the baseline.
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The difference is that preservers, as the "good guys", are the ones that are far more likely to be a PC that is part of an adventuring party. As such, it is important that their power level is roughly equivalent to characters of other classes but the same level so that they are not overshadowed by them. Since defilers are usually NPCs, this balance is not as important for them, so giving them an advantage does not hurt any party dynamics.
I am not familiar with the specifics of the new rules since I have not tried to do a Dark Sun campaign in 3E yet. However, if they have made given defilers power equivalent to the core wizard, and preservers a handicap, then a given preserver will be a less valuable member of a party. Since wizards are balanced against the other classes that make up the party, a character with less power than a core wizard will not be a completely viable choice for an adventurer.