To me, It wouldn't hurt so much if they allow this. As you said, there are other ways of getting out of the trap, so disabling backslide and snap won't be much of a problem. On close confine, If i am not mistaken, there are other ways to get out of it besides the usual. And the best skill of a stalker can be easily countered by one buff from a creator, and if you are the type that don't buff everytime(like me), I still say it isn't that big of a problem. A character shouldn't be ALWAYS be able to take out EVERY class, so if assasins fall against stalkers, then it is part of life. To spider web, hmm if this is too overpowered as others see it, then put a backlash on it.