The thing with P7N is once you've seen the mechanics you know what to do and it's unlikely you'll die to them again. The fight doesn't have much randomness outside of getting yak or bird while needing to get close to the boss at one point, so you always know what's coming after having done the fight a few times. I died to P7N myself the first few times and I just quickly learned what not to do. I think the only thing that still gets me sometimes is misreading the exaflares so I get clipped by like, 3 of them. (and they actually don't 1 shot) Getting one shotted sucks, but it also just makes me be more cautious/pay attention more as I learn the fight.