I think Blue is just constrained by rules, and isn’t sneaky (just plot devicey). They could make her sneaky because how they wrote her but not sure they intended it all along in some master plan. Even as Sneaky Fairy, she would be Sneaky and Ineffective with how things have gone down depending on what motive they were giving her (like restoring magic might sort of kind of work in some chess match with fate setting limits for her).
Anyway, I would like to see Tink restored to being a fairy. I liked that Wendy and Tink had that conversation. I’m just sort of curious though, are either of them headed for heartbreaking confrontation with Pan?
“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass