Schrödinger's cat says keep hope alive until you open Pandora's box.
More likely it's MacGuffin Tetris
For those too lazy to right click and search:
Chekhov's gun is a dramatic principle that states that every element in a story must be necessary, and irrelevant elements should be removed. Elements should not appear to make "false promises" by never coming into play.
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The Fey seem to be visible when they feel like it or does their magic aura also hide clothes? Would this even be a thing for Fey that believe they are superior thus having no reason to hide?
Could someone see Fey if they were high on drugs?
It's convenient to write them off when the story demands it however just raises questions about how they interact and lets be reasonable consistency isn't a strong suit here.
Neat lore tidbits btw