Very interesting point that. Personally I've been more successful from a slightly elevated position. I.e rocks, piers, breakwaters etc
Elevation is just a vantage point for me, if the structure, habitat and food sources are available, you can catch just as many fish on lures down the side of a pier wall or jetty post and you can standing on a beach or shoreline. I suppose it's down to personal preference, mind you piers are normally my last choice, but this is mainly down to too many other anglers more than the location itself. (I like a bit space! ;-))