I can tell you that I went into the game with the mindset of turning off all those bullshit instinct powers. But playing on hard you NEED instinct to play the game like a hitman game. Otherwise without some instinct you can't use disguises as you once could, and it turns the game into more of a splinter cell game, using cover.
For some reason people of the same costumes can tell you're not one of them from impossible distances and within seconds. But you can roll across rooms (the jump to cover mechanic) in front of 10 guards, without anything happening.
And for people saying just use instinct, it's not the simple. On hard you can't just stand still and not use up your instinct. Anytime you use it it depletes. So I am now knocking people out for no other reason than to build up instinct, so I can use the magic ability of covering my face.
I hate that I can't play this game like a Hitman game. So disappointing.
Pretty much mirrors a lot of other posts I've seen on the game. Forced confrontations to replenish a meter of something no one wants to use but has to on higher difficulties remains one of the more mind boggling design choices I've seen for a stealth game.