"The pyramid of endurance" was always a horrible joke the PR people made up when drunk or high. Yes in reality you might have essentially took the 'priests' out of the of the regional series and black-and-white classified all of them at the bottom of your French-Egyptian hierarchy, you know in the sort of 3rd class passenger list of RMS Titanic that gets spit on, but it makes the series look weaker when they are placed in lowest division - shared by many sorts of people jammed together. It is as if winning the championship in individual series didn't hold that great of importance in the grand scheme of things, and as if everyone was working towards the upper masters and Pharaoh.
