Why are the wings 2D?

Question Why are the wings 2D?
Answer There are only a few options for easy-to-use angel wings on the BOOTH store which can easily be used in VRoid Studio. The ones on the characters now are the ones that looked the best, but unfortunately they are 2D and not 3D. The color and texture cannot be edited (TMK). And they are also technically hair pieces, so they move with the models' heads rather than back. Nonetheless, I am grateful the option exists. They come from a wing dress set.

I plan to learn how to add 3D wings to a model manually using Unity, but it will probably take me some time.
Edited

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