I keep seeing a lot of archetypes thrown out that "don't make sense" with Thieves' Cant, but at least so far all of them either a) aren't really a big enough concept to be a "class" (IE: Trapsmith is a crafting skill) or b) would fit much better into a different class (IE: How is a scout anything but a Ranger, or maybe a Fighter?) or c) aren't exactly far fetched to have Thieves' Cant anyways. (IE: Bounty hunter. How do you find criminals the law can't find? By talking to other criminals)