I don't think your thoughts should be assumed to be unappreciated. Another point that you could consider that is mentioned in most reloading manuals is that some slow powders burn erratically when attempts are made to use them at a lower pressure than designed.
I suspect ringed chambers are as you say, somewhat unpredictable, likely not very prevalent, but apparently a pressure spike or localized pressure spike. I have all the mentioned references, just not quite the time to dig into them for curiosity and to see how they might relate to ringed chambers. A common theme though seems to be relatively high volume cases, with the intention to load to relatively low pressures?
