Richard
You raise two issues, the question of whether one likes NATO straps, or not, must be one of personal choice. Of more significance is the durability of the straps, I would have thought the occasional immersion in water would not prove fatal.
If I was deliberately going to get the strap wet or had any doubts about the matter I would change it for a rubber one or fire hose!
A valid point has been raised - others will doubtless have their say!!
Gavin