Why isn't Azalea wood vanilla?

I've never understood why azalea trees are the only tree not to have it's own wood type, why did Mojang use oak then immediately go back to adding new wood for the next trees added.

Moss layers and especially surface moss are nice blocks for building overgrown and dilapidated structures as it really helps as a sense of age to blocks without a dedicated moss form. My only issue with them is the surface moss is a very bright green compared to traditional mossy block variants.

That being said, the azalea flowers are a bit weird to me, how do you cut a flower off a bush and then get a full flower that can grow in the ground? Additionally, the flower textures aren't the best in my opinion, looking a bit square.

This mod is good overall and I would recommend to anyone who likes building i overgrown structures or who just likes more wood types.