I personally think ludonarrative dissonance is by far the biggest nothingburger in gaming. I have zero problem suspending disbelief when game mechanics don't line up with story (the old "why didn't they use a Phoenix down on Aeris" thing). It's fine, the two are separate and it's no big deal. I find it far more damaging to my enjoyment of the game when the designers/writers bend over backwards to eliminate this dissonance, because it is almost always awkward and just takes me out of enjoying the game.