You sure wanna make your life a living hell for your fighters huh?
How can you get the best items with out a lock pick? mages? Well, look at it this way
That one spell slot can be replaced with a more potent spell when you have a theif in your party. Not only that, you get to pickpocket, detect traps, or set traps to your liking. All in one! Instead of all fighters, might as well add in a backstabber
My two cents
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You guys heard Chiharumut, whattabout Ba[H]eartamut??? 