Everyone care about level design and make graphics ultra realistic. But why we should so care if we have a real world with billons of molecules and real ray traced light. Just a little thing that we need to add to that reality is story and quest part. It can be easily done if we have such device as iPad with extended reality functionality.
Image that you live near the park and load game for your location. You have a story, virtual stuff like magic and enemies they are projected on a real terrain. And you walk and complete fantasy quests in reality. Pick bottles of mana and health. Communicate with other users in reality throw the game.