The problem is that a multiplayer game can never be perfectly balanced. Some combination of strategies will always be more successful than others, and given enough time and communication, players always figure it out.
Which is why for some games, lately the focus has been on “meta balance”. In other words, balance changes are not permanent but temporary, and the developers continuously adjust the game’s numbers according to the current situation.
So when something proves too powerful, it gets toned down, while less used components of the game eventually get more attention. That way, the whole game works nicely and allows players to choose their own playing style, instead of feeling like they’re forced to stick with one path if they want to win.
So far, “Clash of Clans” has been great in terms of offering diversity to its players and a deep enough gameplay to keep them attached for a long time. We’ll see how the game is developed in the future, but it still has a lot of potential for interesting new gameplay additions, especially if players continue to give regular feedback and make interesting suggestions like they’ve been actively doing since the title game out.