The design behind "Tanking"

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Originally Posted by Niph

Everyone can switch to any role if necessary (if they worked on their toon to be able to), so I don't see that as a big problem.

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Eventually you can, but many players don't have several classes, and the gear for those classes, until they've played quite a bit. Or want to be forced to level a tank/healer class just so they can get groups when those aren't available.