If you watch Puke Flystalker in the scene where he gets his light sabre, and ignore the CG’d in “blade”, you will notice how he would have pretty much decapitated himself!
I’ve been on both ends of this, ie from a GM and Player side and the frustration can be palpable. A ‘skilled’ Slicer failing a very simple slice to access a part of a computer system that he knows pretty well! THREE TIMES IN A ROW!?!?!?