The best idea I can think of as far as "Quality of life" changes for warrior would be something like Overpower changing to conform with flash/unleash?
And I appreciate that some people have never had a problem with Overpower, but playing on 200~ ping it's hilariously arbitrary if you hit a thing you should hit or not with overpower.

...But as a Omni-tank who raids, that is literally the only thing I think is a bit worse on warrior than the other tanks. Apart from lacking extremely job specific actions like cover, Warrior has the best pull rotation in the game, the best stance-dancing in the game, the best snap aggro in the game and Onslaught being nearly "always available" outside of IRZerk windows makes their mobility really high.

Besides which your tank stance (that you never need to use, I guess) - is probably the most powerful if tanking and staying alive is a priority.