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They have failed to balance 22 jobs properly, or if you want to limit it a bit, they have failed to balance even 2 different tanks properly so that both have a real use, since PLD massively crushes...

It could limit it by having some abilities so powerful that they become expected. For instance how THF used to be expected to /NIN, or how any single-handed job in the game is forced to /NIN or /DNC...