>>54942825It's not like Fairies have... reality to base it's type interactions on. The closest thing we have to that is the origin of Fairies being unable to interact with Cold Iron, making a Steel Resistance the only sure-fire thing they should add.
If anything, they should be well adept to handling poisons too, given that Fae are known for dealing with alchemy and such. But a decision was made to make them weak to Poison for balance changes.