Matt, I will give you my opinion but it is just that. Lets remember that none of Stan Meyers claims were ever verified by anyone other than himself. There have been others that have made the same claim but Stan Meyers is the most famous.
Lets assume that Stan did actually run that Dune Buggy on just water using a wet cell. The reason none of us copy that is we have no clue how he did it. Many, Many have done their best to replicate his work but all have failed every time. His Dune Buggy is intact and in someones hands right now as is all his work but oddly enough no one has made it run since his death. I for one am very doubtful that it EVER ran on water. I would love to see it happen but there are just too much evidence that it never happened and too little that it did. If what Stan claimed happened really happened it violates all laws of physics.
As far as wet cells compared to dry cells. We use dry cells because they perform better than wet cells for all of us that have tried both.
Yes water does split easier at higher temperatures. I did build one Nickel cell with Teflon gaskets and a Stainless Resevoir for high temp tests. I have some video's on my Youtube channel with that build. I built it for high temp tests but did not show any of them on Youtube because of the danger involved. The reason we don't do that is for two reasons. First you get water vapor out (steam) that contains KOH. It is hard on vehicle engine parts. The second reason is that the gaskets, hoses, and end plates can't handle the heat. I made mine using Stainless and Teflon so it could handle the heat but those materials are too expensive to be practical. In order to keep the vapor out of the gas at high temps you need to run the cell under pressure. Pressure and HHO equals a huge bomb. The other side of the coin is that it takes lots of excess energy just to get it hot.
Larry
2008 Nissan Frontier 4X4 Nismo. 12 MPG baseline with my normal commute and heavy stop and go daily driving. Generator installed and working on 3/29/2009
Up to 14.5 MPG with no enhancers. Still testing the effects of lots of HHO and no electronic enhancers.