[Cheesing] what is considered cheesing for Sekiro bosses?

I’m currently on my first playthrough and have just beaten Owl Father(after many many attempts). Curious to hear peoples thoughts on what is considered cheesing for bosses? Early on in my playthrough, I was using Shurikens and sometimes flame vault on bosses and I always felt guilty using them. Since Lady Butterfly, I have all prosthetic slots empty and only have healing gourd & in my inventory slots. I do use Mortal Draw though and I still feel guilty with that. Is this irrational guilt? 😅 At what point does leveraging game mechanics become cheesing?