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Ease of design and lack of manpower I would guess @Remano88. As time has gone by the original developers that really understood the game will have left. King will also have reduced the amount of developers working on the game as there is less to work on. It is much easier for new designer's coming in to King to work with just ten names than it is to continuously dream up new themes. This iscespecially true if there is only a small team of people doing the work.
This is just a guess on my part though, so I could easily be wrong.
@82092535 Are you sure that all of your Episodes have the same name? Don't you see names like, Chocolate Mountain, or Soda Sea on your map?
As for new events make sure you keep your browser/app up to date and clear your TMP files/app cache on a regular basis. Also log in and out of the game and restart your device on a regular basis and this should help.