This is a debate that is ongoing for me. Many courses, particularly those in the British Isles, contain bunkers that are hidden from view without indicators that also dictate the strategy of the hole. As architecture progressed, many architects sought to make bunkers more visible. Willie Park, Jr. did this at Huntercombe, where his bunkers, sand and grass alike, have big faces that dominate visually. It seems many architects, particularly Donald Ross and William Flynn, sought to make bunkers more visible and dramatic, both for aesthetic and strategic purposes.
Which is the better tactic to use? Should bunkers be visible so that players can plot out strategy and tactics from the tee? Or, should bunkers be hidden to create mystery, charm, and strategy that can only be learned through multiple plays?