I don't quite agree with closing 2 of the 4 chests after the puzzle...

"You just solved this intricate puzzle... here's 50% of your reward since you didn't build your character the way that we want you to. Well, that sucks for you. You can always return with a character once the items in these chests have become useless to you. Want to solve another puzzle for aggrevation and half-rewards?"

You do all that effort, then punished like that? No.
That's like doing a quest, getting an option for a fine 1h sword/2h sword/staff and the game goes 'But wait, you have 0 charisma. Oh well, no reward for you!'

I still don't see why lockpicks need to be one use btw.