Originally Posted by Menteith
Name me a setting that actually has a "secret language of thieves"? Because off the top of my head, established settings like FR, Eberron, Golarion, Dark Sun, etc. don't have a secret language of thieves.
Technically, FR, Mystara, and the various other 1e had/have a secret language of thieves, since it was around for that edition and every thief spoke Thieves' Cant...but then, in 1e every lawful good character spoke Lawful Good, too. I don't see why the devs want to go back to that sort of thing, particularly now that backgrounds are explicitly separate from class and secret languages are a perfect example of what should be background instead of class.