They're not an exception because they induce frustration/despair/rage. It's all just trying to bring the worst out of you, and it works whether you realize it or not.
I honestly hadn't thought of this because those bosses were the absolute highlight of the game for me in terms of its actual gameplay, they were a blast. I guess for other folks it could definitely be a miserable experience but honestly they made me wish the rest of the game took more advantage of how crazy its systems could get. :( ---
Let the voice of love take you higher, With this gathering power, go beyond even time!