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So I'm reading everywhere that I need high intuition to see hidden switches and the like.

My question is: how high does it need to be? At the moment it is around 40(?) but I'm not seeing any change. I've found some hidden switches by accident and they are not marked in any way...
As high as to visit a good walkthrough. You see on map whatever is hidden lies... No, i am not trolling! Some secret levers for example, do not even work! So you are going to being wasting good, useful, skill points, on a skill you do not need!