The majority of times, shelter is in a hole under a root ball, or sand bank or hollow tree base or limb. Yes, I have seen monitors in the water at night, but that represents one of of a thousand, its not normal. Normal is to seek dry cover. (dry as possible depending on season) I also understand during extreme periods of wet, its not to be found. But that does not last the potential lifetime of the monitor.
Now consider, we are not talking about what they normally do in nature, you really should consider normal and not exceptions. Exceptions are great for arguements, but suck for understanding an animal. If you keep a captive water monitor or even a far more aquatic monitor(mertens) in a constant wet enviornment it will die, like the 99.9999% of captives imported into this country actually do. The point is, we are talking about a monitor in a potential wet box. Not nature.
So you want to argue a point thats meaningless to why such a high percentage of captives die?
The actual point eludes you like good observations. A wild monitor has choices. If it starts growing fungus it can bask remedy the problem. It can seek dryer conditions. When a person/keeper, thinks about using a substrate that HOLDS water, to keep it moist, it means, moist/wet, 24/7/365. And that ain't natural.
If you live and go were monitors occur, you know darn well, monitors bask like crazy after rains. I have to wonder why? Ok, I know why. To dry off and regain needed heat. You see, wet is a cooling agent. specially in a cage thats being heated. Which is the reality of this post.
A lesson in observation. What bothers me is somehow your training leads you to make conclusions on a few observations. Yes, waters can spend the night in the water, but ask yourself why? for what reason? Also what percentage of the population is doing so? Not just say, see, they do that? Think about this, the quality of observation is not simply seeing something, its understanding what your seeing. What I find odd is, you seem to have more importance in what people tell you, or what you think, then want your actually seeing.
In may case, a high percentage of observations, once investigated, were contrary to what I was told, read and thought. Which is why I often get upset with you fellas. Cheers