In all honesty, the first time I played the game (on Normal), the Kayran fight frustrated me to almost the same level. In hindsight, I found it to be completely unintuitive. I was trying to fight it, and that just doesn't work. I had subtitles off, and the ambient noise of the fight meant I couldn't hear Silé telling me to use a trap. So I fought and died, over and over again, until I got so frustrated I quit. Then after about 15 minutes of doing something else, I searched on Youtube and found a video of the fight, which explained it to me. So I went back and did the fight the "proper" way and had no real trouble with it.
I played it through twice on normal (once for each path) then again on Hard. I did Dark mode once that was released, and really didn't have any trouble with it, but I would not have wanted to start there having never played before.