I can imagine there being locks which can't be picked via simply jamming a bit of metal in and jiggling it about (although yes, it's kind of stretching things/kind of lazy to have that be the sole mechanism for locking you out of certain locations - particularly when we already, to an extent, have a "you can't get through without the quest macguffin" in terms of the claw doors).

What I find really bothersome is, if I was paying for a Master lock on my chest, I would ruddy well expect to be getting one of THOSE locks, not one that just takes a bit longer to twiddle around in.