[tetha]

I'd call it a 'necessary requirement', or even a 'requirement that is good to have'.

Certainly, if I -- as a pretty untrained computer science student -- pick my lock in the largest new yorker police station, well... who cares? Similarly, if you pick the lock of the white house, you probably won't see the president.

On the other hand, if a highly trained marine wants to get out of some police station, he will probably get out of there, and he can raise his chances a lot if his hands are not constrained by handcuffs. (And similar, if a highly trained specialist wants to see the president, he has some chance to do so, and if he can pick any lock in the white house, his chances rise pretty much)