I agree with the OP. I think the wording that they used may be off. Right now based on what was shown.

All tanks can reduce enemy damage-- Reprisal
PLD and new tank can counter enemy damage
PLD can provide protection for individual-- intervention
PLD can provide protection for the party- wings & divine veil

Right now PLD as what was showed can do everything that was stated in terms of both MT and OT which is why I think their splitting is a wording issue. At EU fanfest we should get more clarification to calm our fears. However people are right to be cautious. Especially what happened with AST to where now playing AST and WHM in high end content can be a death sentence.