Only Kaido needs Advan
Narrative wise, it obviously helps to keep interesting, cause it boosts diversity and powerlvl wise it simply balances things out.
ced CoA to be hurt.
Big mom needed to use her haki combined with her divil fruit( G4 flame pattern, Katakuri sticky mochie flame pattern), and her body weight to block a normal G4 Boundman Kong Gun without Advanced Haki.
It still shook her arm indicatiing she felt that hit. Only Kaido can take attacks G4 without haki.
Narrative wise, it obviously helps to keep interesting, cause it boosts diversity and powerlvl wise it simply balances things out.
ced CoA to be hurt.
Big mom needed to use her haki combined with her divil fruit( G4 flame pattern, Katakuri sticky mochie flame pattern), and her body weight to block a normal G4 Boundman Kong Gun without Advanced Haki.
It still shook her arm indicatiing she felt that hit. Only Kaido can take attacks G4 without haki.
I tried to keep my post shorter, so I didn't really went into detail.
Thing is, Boundman's raw power is already very high and assuming that you don't have the required lvl of strength to create that AP or a DF with the casual firepower the Admirals' fruits have, you would definitely have to learn atleast adv. CoA lvl1, in order to fight her efficiently, like blocking/deflecting her punches and doing damage in a prolonged battle.
I mean if not for this, you really can just hope to beat her if you have again, raw strength as high or higher than Boundman constantly or some other fruit with similiar firepower, which is by far not the regular case.
Look at the Commander lvl guys. Out of her own crew no one can seriously damage her for example.
So you do have a point, but still..