Keep in mind that almost all of this was safety checks, if you don't care about that then there were only a few pretty simple steps.

Right but my point is if you're premeditating the theft to the point where you've studied the manuals/practiced in flight simulators then a key isn't going to be the thing stopping you. I mean will that person realistically go "oh man, I've spent 100 hours learning how to pilot this thing, snuck into the plane, properly fueled the plane and did weight balancing but shit I don't have the keys, guess I'll just go home!". Nah, that guy is hot wiring that plane or stealing the keys on his way into the plane.