I know Rhys, I take your point, but these guys are another added potential problem that didn't exist until their appearance on the scene....and it can only get worse as their popularity rockets (which as you are aware, IS happening).
I also think that the easy access to areas previously inaccessible to anglers that these craft allow puts the fish under huge added pressure, never mind the anglers. Fish are not about to join Mensa, it's true....but they have a strong enough survival instinct to know there are certain areas where they are relatively safe, where they get no pressure...and these little havens they retreat to are vital to fish.
I have seen the results in a carp lake when all the snags, trees in the water etc., had been removed to make the fishing easier for the unskilled louts who had gradually taking over the place. Most of the old fish died from diseases that their immune systems had coped with for 30+ years....until that immune system was compromised by the unbearable levels of added stress this action brought about. That is FACT.
Am I bovvered? Yes I bloody well am
Cheers, Dave.