Honestly i don't mind Cud Chew much because it feels Dazzling the Third or Sap Sipper (If it keeps that) are gonna be the more competitive relevant abilities. Cud Chew just reads to me as a funny gimmick option for a mon that would already have 2 other pretty fine ability options either way. Say what you will about signature abils but I think its fine if they want to just make the ability fun, even if not strictly competitive, as its own little gimmick.
The thing is that we don't know if other Pokemon will get Cud Chew, including older Pokemon with only one normal ability(Similar to how a handful of Pokemon got Competitive as a second normal ability in Gen VI when the ability was introduced). Armored Tail is pretty Farigiraf-specific fluff-wise so it would make sense if that was it's signature ability, Cud Chew in both English and Japanese can apply to a whole host of Mammalian creatures