Once you level a necro to 60 you've attained virtually all the knowledge needed to level any class to 60. Each class has a little bit of specialization but you probably already have a pretty good feel for how each class is specialized just from interacting with the other classes. Every class will have a small learning curve of how to play the class effeciently.
Playing multiple classes doesn't really advance your understanding of the game much when it comes to leveling content. It really only matters if you are one of the handful of bleeding edge raid strategists that are pushing the limits of current or new metas, or to a lesser extent a raid leader (many are more like a raid manager). In that world there is nearly an eternal depth of things to learn and quirks of different game mechanics and fringe abilities that can help cobble together some impressive strategies. Its basically the difference between current raid metas and ones we saw during classic live for this era.
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