Truthfully I believe that there are several ways to skin a cat - or in this case keep a horse.
My comment was only intended to indicate how it was interesting how the same passages led us to very different conclusions - I did not to intend to provoke a discussion on horse management.
Regardless, I believe that there are different ways of doing things and not everything needs to be ranked as good or bad. I also don't ascribe to the theory that there is only one way or a horse will die. Personally, I prefer to keep my horses grazing 24 hours a day as I think that is best for their metabolic health. You are absolutely correct to say that there are million of horses that do fine stalled and receiving hay 2-3 time a day that thrive (or any mix of the above) and I did not indicate in any way that they suffer. I have kept horses in both situations each has its benefits and drawbacks- like many things in life. Just because I said I found the advise in the article well founded does not mean that I am so closed minded to believe there is only one way to do things and no other way could possibly work.
Personal anecdotes to not prove a fact - there are outliers in every experiment. Your comment indicating that my assessment is not true to fact is amusing to me. There is plenty of research on horse management. And the fact is that there are several different opinions that are drawn from those facts. Much of what I have read indicates that the metabolic health is dependent on constant use of the horses digestive system. The article was describing how this system also helps to heat the horse.
Your guess that I have never seen a rain soaked horse... Rain? -that is when water falls from the sky right? I do live in the dessert but it does rain here too- shocking I know. That being said my experience has been more similar to what was described in the article. I do not doubt your experiences at all when it comes to horses and shelter. Horses are like people they are individual - some walk in a shelter some do not. There isn't any overarching theory that applies across the board to all horses in all situations etc.
The biggest thing I have learned in the horse world is every one is an expert - with their very own facts! And the lesson this has taught me is to listen to each of these experts because they almost all ways can teach me something or at least give me a new perspective but it has also taught me not to be critical of others and attack their methods or thoughts.
I am sure what ever you chose to do for your horses works well for you or you wouldn't do it. We all find what works in our own situation and for each of our horses. When I see someone with different way of doing things I don't assume they are wrong just because they are different - but then again I am rather open minded and progressive.
My intent in sharing the article was simply in the hopes someone else would enjoy learning something knew (as I did) and enjoy the article. Peace.