This might not be aimed at me and I can make no statement about whether or not they're bitter but just because a job is being outperformed by other jobs within the same role does not automatically justify damage buffs, even if it might "feel bad".
You'd have to look at warrior's toolkit.
It has the same base mitigation tools as all the other tanks, 20% on a 90sec cooldown and 30% on a 120sec cooldown.
On top of these it has ToB, a 20% HP increase and 20% selfheal, and Equilibrium, a 1200 potency selfheal, which I'd argue are the cooldowns competing with cooldowns like Dark Mind, Camouflage, Aurora and...well, nothing from Paladin really since I can not count Clemency as a regular mitigation tool. Dark Mind, unlike ToB, only works on magic damage and Camouflage can basically only be counted as 10% mitigation since the parry is too inconsistent and ToB adds a 20% heal on top of 20% more HP. Equilibrium has the exact same potency as Aurora and Clemency, but unlike those it heals instantly, doesn't cost resources, does not need to be cast and does not cost you any dps nor does it disrupt your rotation.
And then for short term mitigation we have the choice between Raw Intuition, which is stronger than Heart of Stone and equal to Shelltron (arguably even better since Shelltron is inconsistent against enemies that can crit), or Nascent Flash, which on average heals for more than you could mitigate with The Blackest Night, neither of which cost you resources or can lead to a dps loss.
So all in all I would say that warrior has the most reliable, most consistent and strongest defensive kit out of all the tanks and with that in mind I would say it is justified that you do less dps than other tanks. This is why you normally only compare logs with other warriors, to see how skilled you are compared to other players of your chosen job.
Now we could argue whether or not we really need those strong defensives when all other tanks can survive every mechanic just as well and deal better dps on top of that but looking at the entire warrior kit then I can't agree that warrior really needed or deserved potency buffs. If doing less damage than other tanks makes you feel bad then sorry but just deal with it, you are the beefier, tankier tank and you can't have both top damage and top mitigation, and this coming from a warrior main.