Well, that's fine with me if people want to defeat their automatic systems. If I am running my fridge I want it to switch to propane if the electric power goes out rather than deplete the line of propane and let the fridge shut down and make it harder to switch to propane. When you let the propane run out in the fridge line the orifice is so small it can take a lot of start attempts to get the propane back up to the fridge burner section...depending on how far it is from the propane bottles. As far as the auto changeover regulator, I use it as it was designed to be used. As long as it takes to use up a bottle of propane I can't imagine not remembering to look at the regulator to see if it has changed over before running out in the second bottle.
Let see, I can't remember how long I have been using auto changeover regulators...I guess at least 20 years. I have always used them as they were designed to be used and have never ran out of propane unexpectedly. When boondocking in cold weather I have got down to where I would run out if I didn't go refill, but not because I failed to look at the regulator to see if it switched.