Vengeance potency should be added to WAR's abilities. If it adds about 165-220 potency per two minutes, add some potency to eye and path to make up for that.

At 200 potency Onslaught does more DPS than a fell cleave. Fell cleave is a 590 potency move at 50 gauge and 3 onslaughts is 60 gauge at 600 potency. However, Fell cleave costs a GCD and onslaught does not. This puts Onslaught at a potency gain over fell cleave.

WAR really doesn't need potency buffs. Just QoL buffs. DRK needs potency buffs if anything.
if you made onslaught do more damage, then it would be a dps loss if you did not use it. it being low makes the gapcloser essentially for free, which gives warrior far more mobility than the other tanks. buff upheaval and add more ogcds. warrior needs at least ONE MORE. if anything, that is what IC should have been.

warrior needs both. but it also needs potency nerfs (Fell Cleave and possibly Inner Chaos as well).

war needs animation buffs. Do not call it a new ability and not even provide it with a unique animation. they need to buff Holmgang by removing the bind to the enemy.

Storm eye seems fine buff but that seems more like a quality of life change than a buff. Vengeance would just force WAR to be MT as it kinda already does with its damage tied to it, if you have a WAR OT you are losing damage. Inner chaos doesn't come up enough for this to be a signifcant buff to their numbers so it wouldn't be much of a change.
Making onslaught better would be nice, but how the job flows you don't onslaught unless you have to, during IR, or if you somehow need to dump beast gauge. Onslaught would need to be more of a DPS gain than Fell cleave for players to use it. Upheavel works because its a signicantly higher scaling with beast guage and damage vs fell cleave.
you can just swap. you have provoke and shirk. simple solution.

They are not going to buff damage of any of the tanks, just some deffensive stuff.
It is their statement from the live letter.
SE says a lot of things. That doesn't mean they actually stay true to their word or follow what they say. Before the current expac came out, they acknowledged that warrior is the MT and that they wanted to make it so there were two MTs and two OTs, and look what happened? a new tank was a MISTAKE.