It appears that sometime in the Thieves Guild questline you get a
"Masterkey", or a skeleton key. Lockpick that never breaks. Doesn't this make the "easier" perks useless?
It DOES make the easier locks perk pointless.. How could they do this to us.. Add the skeleton key again? F*
Just because someone loves to pick locks, doesn't mean they're going to have anything to do with the Thieves' Guild.
(I would always get the skeleton key in Oblivion, because it was just a Daedric shrine. But I can't see wanting to join the TG.... I rarely did in Oblivion. I've no interest in breaking & entering NPCs homes & robbing people. I lockpick to get through doors, chests, and traps in dungeons.)