I read with interest the message on the fishermen in Durban. I carry on myself some research on Durban and I became interested in the historical construction of landscapes of sea shores and beaches which started in the 18th century in Europe.
My hypothesis is this vision of sea shores came with the European settlers. African people were excluded from the beaches during apartheid period, and in this area, KwaZulu-Natal, there were never a great tradition of fishing.
In short, beaches and sea shores with piers are directly imported from Europe, and in this representation, local fishermen were/are excluded of the piers and beaches (read the historians of landscapes and sea shores like Corbin for example). Therefore, pushing fishermen out of the piers and beaches, is build up a "perfect" beach landscape...following the European models. Of course, it is not the only reason as you have mentioned, but beaches are also landscapes historically elaborated in specific cultural contexts.