The big three can do just as good on BC "HNM" (if you can even consider them HNMs) besides a select few, ouryu and bahaV2 comes to mind. And I don't even know why you're complaining if you don't do HNMs that actually matters.
And I dont know why you think i dont do HNM in your eyes that matter. ENDGAME content involves a hell of Lot more then Aery, Sorrow, Dominion, lolRange, Chasm, and lolTomb (things i fought countless times and still do). Speedbelt wyrm, is just as much a "hard notorious monster" as Onryuu, and Bahamut. Does something have to have uber drama and be camped before it is considered an endgame hard notorious monster? I dont even know what your argument is about...
The "big 3" do not do "just as good" endgame. They only one that does just as good is Cannonball. And the rest are "ok". And everyone knows it. And is the exact reason no one ever "desires" blu endgame because so many other melee do it better, except for the few hnms they want you to spam cannonball on, cause no one is meleeing it.