Breaking in the ol'e pipe

Something I was told when I first started concerning the whole 1/3 1/2 full fill on a pipe was the reason some did the the 1/3 1/2 was to make sure you got a cake started at the bottom of a bowl. This was because alot of smokers did not smoke all the way down to a fine ash with a full bowl so you would end up with a nice cake formed in the top half and none in the bottom. Now I do not know hoe true that is nor did it much matter to me as I smoke mine down to the bottom with little to no dottle. just some food for thought.