James Gasik
We don't talk about Pun-Pun
And it only steps on the Rogue if a given Rogue would actually want to use their Expertise on Thieves' Tools. Given that playing a Rogue (or any class, for that matter) is supposed to not be necessary to play the game (you want a party of four Druids? Sure, go for it!), it doesn't really make sense to make something a "Rogue-only" option.