Anyone else find the decision to code Raava as femme and Vaatu as masc an interesting (although not necessarily bad) choice?

I've been doing a lot of reading into various spiritual concepts and practices from around the world and typically light/order/yang is masculine and dark/chaos/yin is usually feminine. Is there another concept that's being referenced or is this just a minor but interesting artistic decision?

I was a little disappointed that they played Raava as "good"; I've always preferred media like Babylon 5 where it turns out the vorlons are fucking with humanity too, but I can see why they might not put all that in a kids show.

Link to the FanArt