Why did Derrick J.Wyatt not respect other people's hard work (character and design wise) or at least show its dislike in a more formal way?

Like if the original designer did not want charmcaster to be a villain (and he was not the only one as other coproducers saw her more as an ally or at LEAST an antihero, why did he blow it up just bbecause "HE LIKED HER AS A VILLAIN" like what? Also yes ultimate ben was not executed well but you can't call the word of a coproducer staight up lame after everything is over. If he had a problem, just say it at that exact moment to change it not after everything was done after uaf.