I mean I would like to see someone here pulls out their academic papers somedays on these manga forum, this part is especially pretty contested because of the contrasting audiences views on gender expression.
Personally? I would like Minato to keep being a femboy (god forbid I call him trap cuz one of y'all will get offended), call it a fetish all you want since it's true anyways. Still if he genderbent, that's just applying a defining feature Mahiro had already, variety is better afterall.