I think that having an option to choose the between a male or female voice for the unbranded videos would be nice for some developers.
Imagine a woman developer, or group of women developers promoting services to clients who interact almost exclusively through written communication. By using videos with a woman's voice the clients would perceive a greater level of skill and professionalism.
For women developers, a man's voice on the video makes it immediately evident that the videos were not made in house. So even though the videos are unbranded they would still be perceived as someone else's work.
It seems like a little thing but it might make a difference for some.