I want to know the answer to this too. The powers and abilities they are giving us seem extremely powerful. I'd love it if as the game progresses some enemies might be able to use the same powers and/or would be more able to recognize when you use them. Another possibility is that some enemies might be more able to resist or be immune to some of your powers and abilities.
For example...
Level 1: You lay a trap and get a guard with it.
Level 2: You lay a trap and the guard notices it but isn't sure what it is and still trips it.
Level 3: Guard notices it and is able to avoid/disarm it.
Level 4: Guard notices it and immediately surmises that you are in the area.
But, if you are a smart player you might...
Level 1: You lay a trap and get the guard with it.
Level 2: You lay a trap and douse the light and get the guard with it.
Level 3: You lay a trap, douse a light, and make a noise so that the guard hurries through and trips it.
Level 4: Lay a trap, but use the trap as a distraction while you sneak up from behind and knock him out.