There is not a single mechanic in this game that has straight-up fucked me more than the lack of information on when Karryn is actually going to get her turn, and how different skills impact turn order (if they even do, and the fact I have absolutely no idea is a problem in and of itself). There is nothing more infuriating than being in a relatively rough situation, and thinking "It's fine, I've been moving first every turn this whole fight, I'll just heal real quick." only to inexplicably be placed dead last in the turn order with absolutely no warning, quite literally getting Karryn fucked through absolutely no fault of your own.The developer could've made the game far better just by clearly explaining core mechanics and including basic turn based strategy features(like a visible turn order)
Could you play better? Sure, you could argue that most times you can absolutely just prevent situations where this genuinely causes you any noteworthy issues. Can you plan for it? Fuck no. The game gives you no way to predict turn order changes, so you have no reason to plan for turn order changes since you can't do anything about it even if you tried. That mechanic especially kinda fucking blows.
If you have fluid turn order mechanics, then the player needs some way of knowing how the tide of battle is changing in order to plan and play around said changes. Being completely unable to do so just makes the combat needlessly luck based.