Even with high sleight of hand, there’s so many vault doors to open, that unless you roll exceptionally well, you’ll still blow through a bunch of lock picks.

Though nothing compared to the high security, unknockable safes, those are pain in the Ass. Even with level 12 rogue astarian, and graceful cloth for advantage on Dex checks, it still usually takes me around 3-4 attempts on average to pick each high security safe.