pyrate
Rollin' along
Well when I hear it both ways, I have to make up my own mind, and I'd rather work with logic here. I understand what you are saying, but I also have a moderate understanding of physics. Cold water is cold, and it has a lot of mass. Cold air is cold, and has very little mass, and is gone as soon as you open the lid and screw around in there.
Water transfers heat really really well. Air sucks at transferring heat. That is why we have huge radiators on our vehicles to loose heat, yet tiny water passages move it away from the engine.
If I don't have ice on hand to make the situation better, I'm better off keeping my cold mass that can still absorb heat. You pour out the water you pour out the only thing you have left that is below air temperature that isn't food. If you don't have more ice, you are screwed.
If by doing it my way, I loose ice faster but keep my items cold, that is okay. Hot air rises, cold air sinks. Inside a cooler everything on top the ice has the best chance possible of holding off the ice's ability to take it's heat away. If you had a perfect cooler, and put food in it that is not frozen solid, and no ice melts, then that food did not get any colder.
So I agree, ditch the water, but only if you can replace it with more ice. If you don't have any ice, keep what cold water you have, cold water still means cold food. Cold air, is worth about as much as it weighs. And put your ice over or at least around what you want cold, if you want it to be cold sooner rather than later.
I worked for a HVAC and refrigeration company out of high school and remember debating this with the owner once. So he had me take two identical refrigerators and load one with bottles of water while leaving the other one empty. I then got to sit there and monitor how often each unit turned on once the full one had cooled all the water. The empty one ran 4x as often to keep air cold vs the one with water bottles. It was a pretty unforgettable experiment as a teenager sitting in a room waiting for the dumb things to turn on only to find out they could monitor it automatically.
I've used that idea for years in cooler usage. Water is better than air but when new ice is available, drain it.