Mfw you use the items the game gives you to use (Scarlot Rot is the goat)
I think changing your armor/flask/items you eat, etc is perfectly fine if the boss fight requires you to do that.
I do however think it's absolute bullshit if the boss requires you to go completely respec your build into a different stat allotment just to beat it.
Or you could just bleed spam with Ansbach and Mimic Tear
Trust me I had my boy Ansbach in there. A shame I couldn't summon my other brother, Igon.