It's a collective problem facing gaming right now. Everyone wants to make something that is easy to learn and hard to master. For Blizzard, it's a core tenet of every game they've ever made.
But what happens when the base level of knowledge required to learn -- the game within a game, if you will -- becomes a daunting task in and of itself? After multiple expansions, it's a problem facing Hearthstone players. Heroes of the Storm's rapidly approaching that point. And the developers behind Overwatch admit it's an issue for them too -- and they don't have an answer.