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Thing to keep in mind is that destro locks and mages actually gain 30% DPS from a Heroism, whereas rogues gain more like 20; as such, while rogues may or may not do more DPS, even sub-20, they probably don't do *enough* more to offset the higher benefit of Heroism to casters.
The main reason not to heroism casters are aggro and/or mana issues; if they're okay on both, heroisming them is a totally reasonable option.
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