Generally speaking: The simpler something appears on the surface, the more work it requires behind the scenes. Think of designing 'simple' software, from the user perspective.
How do you break the window glass, how do you get into the display cases, how and when do you do it so that you're not stopped by the security, how do you carry the items away, how do you get away from the crime scene without being caught... And I'm sure I am forgetting other details. So I can see how it would take some work to make everything look so simple.
