Paladins have really nice damage now. They out parse DRK, so I am not sure what this is about. By your logic, DRK should have more defenses then Paladin atm. Otherwise they are taking the cake and eating it too.
http://ffxiv.consolegameswiki.com/wiki/Goring_Blade
http://ffxiv.consolegameswiki.com/wiki/Royal_Authority
With these two skills, Paladins destroy us on damage. Yes, we can get dark arts to increase our potency to 400, sure. However the issue is there is no way to sustain that. You can maybe do it twice, and then run out of MP and darkside goes away. Meanwhile, the Paladin can keep going up and RA, GBing the enemy. They have higher DPS.
Don't believe me? Go into Shield Oath and parse it. Although I would like to see people with the same stats. I trust the paladin will have 100-150 dps over DRK over a sustained period.
What DRK does have, is higher burst DPS. However after 50 seconds that goes down. Most boss fights last longer then 50 seconds.