True, but being DPS and tank in one, is already unbalanced. If one can soak up tons of punishment, it might be expected that they ought to be able to dish it out, of course, but it is not balanced, then. Tanks should have moderate or medium damage, at most. DPS characters, then, should be more fragile, but more mobile.
Hybridization is important, but needs to be balanced.
Pure role classes (and each frame type is a class, or was in FF) are boring. They are a one trick pony and, with poor balancing (especially with crafting or other ability customization), can be very OP since they have nothing else to rely on. They're very easy to min/max.
For contrast, hybrid role classes are much harder to min/max if the devs have balanced them well. You need a large subset of your abilities to survive and it's much trickier to pick which facets are important for your survivability and which for your damage output.
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MattHunX