You are missing this because you are looking at it wrong. First there are no built in advantages. There are 10 conferences and the standard conference schedule had been at 8 games for many years. A few years back.....three of the 10 conferences, by their own choosing, decided to switch to 9 game schedules. Its not the responsibility of the NCAA to tell the other 7 conferences they need to do it also. Even if the NCAA decided 9 would be the standard that doesn't prevent any conference from exceeding it and going to 10 like the did the last time. Does that mean that all the other conferences have to go to 10?
There are absolutely built in advantages. The number of conference games is not one of them, nor are the recruiting rules of various conferences. Those are artificial advantages created by each conference that has lead college football to the issues it is now facing.