One could, but we would then again be in the territory of 'subjective judgements'. In terms of the situation we have shown, if the socket were mounted on the wall in the vicinity of that WM valve, then a loakk from the valve (or the connected hose) could send a jet of water straight at the socket!
In any event, what you say does not answer my question (which you quoted) as to what is the allegedly 'required IP rating' for a socket in that location!
'Subjective judgements' again - and, in this case, presumably influenced by the fact that things like "furniture knocks and vacuum cleaners etc." are not really a consideration behind a WM