Straw man? Try again. Drks always focus on the lack of resource gain and combo damage yet entirely ignore all the other pieces of their aoe that has no equivalent on other tanks while leveling.

War: 2 step combo. 130+200. 165 avg. 1 aoe gauge gcd/min (infuriate)
Drk: 1 step. 150. 150 avg + flood+AD+Salted
Pld: 2 step. 150+220. 185 avg+ scorn
Gun: 2 step. 150+250. 200 avg.

Gun. Catridge aoe 72.
Pld. Mp aoe 72
War. Gauge on combo 74
Drk. 2nd combo(mp) 72

Literally no tank gets BOTH resources from aoe AND and aoe to spend that resource on until 72+. Plds get mp to....cast cures? Gun has cartiges but only single target spending option. Drk has the lowest gcd average but the most powerful ogcd that is gained at all times via ticks (pulling, out of combat etc), and still gained with other actions (C&S, blood weapon, etc) which evens it out with the lower gcd potency vs other tanks who have none of that. And lets not forget their 2 other aoes which gun and war have nothing to compare and only scorn on pld.

No one gets their full aoe potential until 72/74. Before that drk does similar damage to the other tanks with a gcd and powerful ogcd while other tanks do it with stronger gcds.

Is it boring to spam 1 gcd forever? Sure. Is it weaker? Nope. Flood (pre trait) does the same damage as the best tanks GCD action as an ogcd and has ways to slowly get that resource well before 72 in addition to 2 other ogcd aoes. It just goes into overdrive at 72.

Drk is fine at aoe. They have a low gcd potency but the most ogcd potency. Other 3 just have gcds and scorn.