A rock wall under construction on the beach at Point Deroche, P.E.I., is raising discussion about what is acceptable to protect the shoreline from erosion. Bryson Guptill, an avid hiker of trails and beaches, first noticed the rock wall and beach house development months ago. "It's a problem because people used to walk down that beach and walk all the way along. Now there's so much armour stone that you can't get around. Even at low tide you can't get around."