Personally --

1) I would never remove a move/power by fiat if a game is already in progress. Discuss it with the group first, especially with the person who chose that playbook/move;

2) If I am going to disallow a move/playbook/anything else players can choose, I'll make sure it's known at character creation;

3) I would find a way to make the power more costly (for the character), have consequences, or otherwise not be an obvious I WIN button before I would remove it from play entirely. That said, the power of the Divine is basically exactly that (I WIN) in most occult/supernatural settings.

In every case this only happens after group discussion and consensus. If I wanted to run stuff by fiat I'd still be running AD&D. ;) Your mileage and that of your group may vary, as will what suits your collective playstyle.

At the end of the day, it's your game (you & your group) - whatever you choose to do with it is the right decision for you.