Not it isn’t.
You’ve posited the claim that builds don’t need phys res, because armor is the best.
I’m refuting that claim by saying that your armor value is largely irrelevant. You are tanky because of damage reduction from censure + adcth.
Also, 18% adcth on FW is NOTHING compared to 6% adcth on AAR given the fact that it hits 6-7 times a second, and pierce a gazillion things