1. Downloading this game, you automatically agreed with terms and conditions of this application, where it says (I don't remember which paragraph) that developers of the game can make any changes in this game and choose their own route of developing it. So if they choose to pick some hero and make him an ultimate weapon - it is only their call.
2. Making different purchases, you automatically agreed that YOU are responsible for what you are buying, and nobody forces you to do that. And these purchases are not vital for you. So here goes your own responsibility.
However, knowing Apple staff very well, I would say that they are very helpful and usually aim for meeting you halfway (within reasonable limits, of course). So if you EXPLAIN them, why you want to refund something, they will satisfy your issue.
I just don't see the reason. You target the Jacques hero as a reason why you can't play this game, meanwhile you made some purchases in the past (probably) that don't meet current meta of the game. Now it is Jacques, later it will be something else.
If people get bored by the game and how it goes, they can find something else.
You may try to get a refund, but your reason will sound like:
"I don't like this game anymore (but I liked and enjoyed it earlier when I just started, and when I was making these purchases I was really happy and that was what I wanted to buy), I am bored by doing all the same actions (human nature which is always looking for something new), and all the same tactics. So could you please give me all my purchases back."
Void - 120, Abyss 495
House: Icarum, Gods of War