I said you had sub playstyle because there are different options and different ways the story plays out based on role and side quests (like the Akonian ritual). I'll believe you that you don't win when playing as sub or skipping/making wrong choices in side quests/main story.
In my playthrough as dom top with all side quests and main story done with correct choices, I have the option to destroy Arihama's mind after destroying his body, which would completely destroy him, he can't reform from that.
Here's a screenshot in case you don't believe me:
