FYI, just got a push notification in the game (iOS) that the hotfix/update is available.
As to the questions about the Zones, like Arundal, I would just complete the task to clear it out. If I recall, the intent of the Zones was to help you gain more magic in the particular areas. When they used to have more uses for the magic, it sort of made sense. However, now I don't think it really helps much. If anything, it makes you clutter up an area with all of the decorations and occupy space that you could use to put out attractions.
There is a lot about the game that has changed over the years. They have introduced something new and then basically abandon it down the road. Then they change the mechanics of the game and nullify some of the changes made prior. Probably all in the guise of "based on customer feedback".