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"Fairy" would be like calling Water "Fish type". Its the same thing I've never been keen of with Fighting, Flying and Bug.
Fairies, which also include Goblins, Gnomes, Sprites, Ents, elementals and other mystical creatures are all made of or come from the pic-related substance.
Aether is like a pure element, another state of matter, so its illusions and mysticism can't be compared to the mental powers of Psychic mons, or how its users can ignore the physics of earth like Ghost types.
And best of all it means all fairy-mons don't have to be pink blobs