There are few brilliant female developers. Even fewer good presenters. If the talk given by female is strong and interesting, it is really enjoyable.
But if the talk is weak comparing to the other talks given by males, it is not helping with diversity, but only makes argument what women not good in science stronger.
If I’m attending conference and instead of attending interesting talk you have to listen very weak presentation from female because of diversity,
I’d feel really bad about the organization of conference.