They’re not sub 20 second cooldown. They are exactly 20 second cooldown with only Harpoon having the potential for cd reset.
Only Harpoon gets the cd reset, which means you only have the potential to reset 10% max health restore.
I’ve already showed you that Fury Warrior has Impending Victory, which is a 30% max health restore on a 25 second cd that can be reset with the same frequency as Harpoon.
Consider 1 minute of combat that includes securing 1 kill at the 55 second mark.
Survival
20 seconds - Disengage 10%, Harpoon 10% = 20%.
40 seconds - Disengage 10%, Harpoon 10% = 20%
55 seconds - Harpoon 10% = 10%
60 seconds - Disengage 10% = 10%
Total - 60%
Fury Warrior
25 seconds - Impending Victory - 30%
50 seconds - Impending Victory - 30%
55 seconds - Impending Victory - 30%
Total - 90%
The Fury Warrior holds a significant lead on health restoration in this scenario and the advantage snowballs with every kill that resets the cd of Harpoon and Impending Victory.
I’ve also showed you that Fury Warrior has Bloodthirst which heals for 3% max health with a 4.5 second cd reduced by Haste.
Bloodthirst’s cd is also reduced by another 1.5 seconds during Avatar, which is 20 second duration on a 1.5 minute cd.
So while you can try to say that Kill Command is spammable, you’re likely only going to get 3 or 4 off before the resets stall and you’re sitting that longer cd than what Bloodthirst has. You also have to admit that you would be tanking your offense for the effort by throwing away Focus and stacks of Tip of the Spear.
The reality is that Kill Command is not spammed, but weaved in between your other attacks to bolster them with Tip of the Spear, which puts its common usage with a 2% max health heal very much on par with the common usage of Bloodthirst with a 3% max health heal.
I have a perfectly valid point and have clearly demonstrated such.
You take issue with the health restoration, but I’ve laid out in detail how other specs have comparable and even superior health restoration than what I’m suggesting.
You try to muddy the argument by bringing in matters such as gap-closing, root clears, and increased movement speed as though these other specs suffer any less time on target than Survival, as though they don’t have their own tools that provide comparable effects.
Terms of Engagement and Posthaste are nothing new. As they are on live, no one has any issue with them because every other melee spec has comparable means to ensure target uptime. The difference between Survival and these other specs is the lack of self-sustain. Exhilaration alone is not adequate. It doesn’t compare. My suggestions would merely close that gap between the self-healing at the disposal of the other melee specs and that which Survival is sorely lacking.