i'm laying down why Yamato
1) sucks as a character
2) sucks as a straw hat
Now the reasons for point 1 are very simple , we have this daughter of the antagonist as a MASSIVE sudden power up to the alliance right out of the fucking blue , all the preparations , all the gathering of intel , weapons , soldiers , it amounts to peanuts when compared to Ultimate Haki Mythical God Devil fruit President Yamato, also Oda using Kaido's own daughter as a plot device to let Kaido not run around slaughtering the alliance( wich would have a sight to behold) is garbage writing.
Also i promise you , if Yamato was any other type of character then a Big Boobies, pretty face Female the backlash would be right about 100 times as much , so stop being a simp and rebel to this plot destroying bitch of yamato.
Now as to why she sucks a straw hat :
We have 10 god damn fucking chacters as a main cast , 9939429420420429 secondary characters , the straw hats are pretty much just a add-on, i say no this bullshit , we love the straw hats , we followed their journey since east blue , we have seen them grow both as characters AND as fighters , and guess what ? their plot relevance is right about 0.00000000001% then what yamato plot relevance is, FOR FUCK SAKE chopper fought queen for a few chapter and healed some people , Brook defeated a NUMBER yes a useless trash NUMBER , yamato did that as soon as she was on screen right after CASUALLY knocking out a FLYING SIX that Nami actually took some effort and MASSIVE help in beating.
Now Luffy , he trained his entire life , we have seen him struggle time and time again to grow more powerful and finally after 1010 chapters he's able to somewhat go blow for blow with Kaido ( alltough for a very short time ) AND GUESS WHAT ? plot-girl... uh i mean Yamato just SPAWNS in the middle of the war AND BEM BLOW FOR BLOW WITH KAIDO WITH ADVANCED COC , COA ,COO , ONE OF THE GODAMN RAREST DEVIL FRUITS IN THE SERIES AND 28 YEARS OF TRAINING THAT WE NEVER EXPERIENCED AS READER TO FIGHT KAIDO , FUCK THIS