This is something normal, in each tier there will always be a threat that you must cover so that your team is good, it is not something new, nor is it that something is used only to specifically stop blaziken to take it as a centralization.
Blaziken does not have few answers, the fact of being locked in a play makes you need effort to predict what to throw, normally you will be throwing u-turn many times and there are things that are usually played rocky helmet, that combined with it being vulnerable to all the hazards will only make pivoting less easy. so you have to think well even when to hit and when not, here I will mention some counts withn los calculos incluidos:
252 Atk Blaziken Close Combat vs. 252 HP / 252+ Def Quagsire: 78-93 (38.6 - 46%) -- 3HKO garantizado después de la recuperación de Leftovers
252 Atk Blaziken Close Combat vs. 252 HP / 204 Def Altaria: 42-51 (23 - 28%) -- 78.5% de probabilidad de 4HKO
252 Atk Blaziken Close Combat vs. 252 HP / 252+ Def Alomomola: 81-96 (29.7 - 35.2%) -- 4HKO garantizado después de la recuperación de Leftovers
252 Atk Blaziken Close Combat vs. 252 HP / 252+ Def Poliwrath: 73-87 (37 - 44.1%) -- 99.8% de probabilidad de 3HKO después de la recuperación de Leftovers
I am being the most usual, I also want to mention nidoqueen bold who receives 3 hits, in addition to mantine who is only hit by thunderpunch
Now, blaziken, even being a bandana, is outclassed by other things, like unfezant,rotom, etc, in addition to making a base 80 lasso like a gallade and even risking hitting, although the life orb set, like you say he can surprise and make holes defensively speaking that's the job of the wallbreak the problem with this would be if he had at least above average speed but 80 speed isn't the best in the world and ends up getting outclassed by a lot of pokemon on the level, same goes for cb blaziken, that power makes up for the lackluster speed it can have compared to other pokemon.
Based on the offensive uber rating it should be a pokemon that can remove a lot of the level very easily or with no problem at all blaziken doesn't fit into this it could add more information to that uber rating but even if it does blaziken still I wouldn't find it.
Maybe at some point if the level is changed too much I will have a different point of view, but for now I don't see that it is a problem that should be addressed.