For the most part, yes, open world games have markers to guide you. But usually they include a few puzzle quests that want you to figure out it by yourself like in Skyrim, Fallout, Dark Souls too. Even though I see what the Op is saying, i really dont want this to become a norm. It would definitely increase time consuption figuring these locations out when you could be progressing in other areas of the game, let alone the fact that not everyone has a lot of time on theirs hands to roam mindlessly in a game.