What is the logic behind Rogue sneak attacks working off of adjacency rather than whether the target is threatened by an ally?We don't really have the concept of threatened in 5e, adjacency in essence replaces it from earlier editions
— Mike Mearls (@mikemearls) September 3, 2017
We assume any adjacent foe is close enough to distract
— Mike Mearls (@mikemearls) September 3, 2017