The balance in SP RPG games does not mean that all choices produce the same result or outcome. Or give same amounts of XP for that matter. It only means that all options you have should be similarly viable.
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No, you are wrong here. All options SHOULD be VIABLE not similarly viable, just viable.
But it seems to me you are only talking about combat here because talking your way or sneaking past all enemies is not possible in this game. In fact how many RPGs have a non aggressive path through the game as a viable way to finish it?
You don't need 120% resistance to everything to beat the game but it was an option that was open for those people who WISH to have that.