They aren’t really, and any sensible angler would think so, simply because SOT kayaks don’t provide their operator with any protection from the cold water and weather that are typical to the North Sea, and to other regions where the climate is cold.
Here’s a recent article on this subject: Hvorfor Wavewalk og ikke S.O.T.(Sit on top) i nordiske strøk.
The author is Eric Overdijk, a Norwegian outdoorsman, kayaker and fisherman, ,who happens to be Wavewalk’s distributor in Norway and Sweden 
Coincidence? There are few real coincidences in life -
For many years, Eric used to paddle traditional sea kayaks and touring kayaks, until he realized his back wouldn’t let him do so anymore – The pain was no longer tolerable. Eric discovered the benefits of W kayaks first as a paddler and a camper, and then as a fisherman.
