I feel like we've been here before. Have we been here before?
Out of interest, how many people expect PA not to crit during a fight? I just factor in that out of five hits she's probably going to crit once, and go from there to have a rough idea how a fight with her is going to play out. If its a calculable estimation from both players then it takes some form of skill to tweak the odds in your favour to get the outcome you want. One of my friends gets worked up about this a lot when he plays Hearthstone, he never thinks through what other players could have in their hand and makes all kind of avoidable mistakes because of it then blames it on RNG and getting lucky and so on. Thats not to say that RNG doesn't occasionally screw you over, but as long as you have some form of none-RNG player interaction, you can take steps to minimise the impact RNG is going to have on your performance. I would consider it to be an expression of player skill to account for more variables in their play. Your millage may vary.
Should RNG be there in the first place is a discussion that could take a very long time to go over, but I would lean towards saying no if, and only if, a more suitable alternative can be introduced that puts all of the control in the players hands, rather than just some of it. It doesn't matter if its Axe spins, Dodges or Chaos Knight, if the player is in total control of when and how they happen its going to push the outcomes of most fights to be entirely skill based rather than partly skill based, but with a small luck element.