And Pld is missing Drks ability to cover magical damage. Not that Pld can't cover Magical, Drks just *better* at it.
This is a moot point, The two damage types are physical and magical, which is more relevant is based entirely on the encounters of the dungeon/raid/trial which is set case by case. For progression general mitigation is near irrelevant when we're tanking in Deliverance/Sword Oath/Gritless. Given the main 'competitive' content will be coming out next week, the relevancy of Phys and Magical going forward will be brought out then.

Drk dance isn't a mere 30% parry. Its 30% Parry, 20% evasion in proper useage, which achieves the same role of Bulwark as mitigation when attacked with high frequency especially in the context of a notably shorter CD.
Granted PLD is the stronger mitigation tank in general when it comes to phys due to having Shield. Drk isn't aiming to be as efficient as PLD passively, neither is warrior as both lack a shield to mitigate that passive advantage.