Why do they have to quit the game if they're displeased with one thing? Seems a bit extreme, unless they did claim it was the factor that will lead them to cancel.
Having one major issue with the game usually isn't a deal-breaker. You and I still play despite disliking SE's gear policy for men don't we? And lots of people play despite hating Eureka in all it's forms. Telling people "deal with it or unsub if you really don't like it" is kind of on the same level of a kid thinking "If you like it so much why don't you marry it?" is a good taunt... it's one thing if you don't see eye to eye with people who wanted to keep the item special, but implying that if they don't cancel their sub over this issue they aren't really serious about it is pretty silly. The forums exist in part so players can give feedback before they reach the quitting stage. This thread worked, and hopefully people won't have to experience this issue again now that YoshiP responded that they will be more careful in the future.