See Baldur's Gate 2, Knights of the Old Republic II or Deus Ex: Human Revolution for why I disagree with the good addition.
If you rather lockpick a door for XP than find the key (since that's not rewarded); that's not good gamedevelopment, but just adding degerative gameplay. Not to mention force one path. Especially fatal in a game that's about giving you as many options as possible.
Yeah, but still bashing the chests should have some downsides. And now for most containers it's faster, less expensive, and doesn't require any skills. So lockpicking is pretty useless.
