Waterproofing wet room in Symbol

I have been concerned about possible water ingress in the wet room as only part of the walls are covered by the shower curtain. I think I have found a easy solution. I have used two spring loaded poles and a flexible shower curtain to fully enclose the waterproof boarding and the plastic moulding on the wheel arch. It is an easy solution which is easily removed without causing any damage to the walls. When not in use it js stored behind the glass holder and is very unobtrusive.
The pictures should explain.[You must be registered and logged in to see this link.]

Is the wet room by its very definition / nature not already waterproof 


Am I missing something here?