I mean you are totally missing the fact that
1) we want more complex DPS
2) we have to rely on the party
Based on the way main and mend works and how tank mastery works every time we have to drop a cast that’s equivalent to a tank losing a 700 potency attack (so let’s use goring blade) every time your healer is GCD healing they have lost a goring blade. You also have to remember healers are casters and have arguably the worst worst movement tools of the casters, your uptime is not a consideration at all and your mitigation doesn’t affect your damage
Healer DPS should be more complex but it 100% should exceed tank DPS because healer DPS is a reflection of the party, tank DPS is just a reflection of how well 1 person can play a slightly easier melee rotation
And I mean do you get angry that at least half the true DPS have easier rotations than the tanks, SMN easily but arguably MCH, RDM and even DNC are easier than GNB