I do not believe that anything gained via Blackout Combo can rival 10% increased Stagger and Haste based on Stagger. At high levels of stagger you can literally have 45% haste, clearing it actually makes you worse off. Whereas really the only pros of Blackout Combo are stagger delay, elusive brawler, flame breath cooldown and Keg smash. All of these things are simply QoL over High Tolerance hence why people are asking for Blackout Combo to be baseline and for something else in its place.
I'm not saying Blackout Combo is good, I'm simply saying High Tolerance (for now) is better.