Healers bring far too much utility to be matching and even exceeding tanks in damage contribution, who do practically nothing BUT deal damage. It's extremely unsatisfying to manage an actual dps rotation only to have a healer deal more damage than you.
https://www.fflogs.com/zone/statisti...=Any&bracket=2
Dark Knight is literally rock bottom in raid dps, which is ridiculous. There is a reason other games don't have tanks dealing less damage than healers. It's not at all balanced and this will hurt the game longterm.