I don't doubt that there may be uses and applications for such a numbering system; but I have been asking for a somewhat different approach in Enhancements for several years.
Actually, it is probably not much different than this numbering system - but without the numbers.
If one goes to a genealogy section of any library, one will find genealogy books in three general styles
1) Descendants of xx
2) Ancestors of xx
3) Alphabeically arranged sketches of a geographical area or area of interest (notable Americans or whatever).
The books that are books of Ancestors of xx will start with the nuclear family of that person as chapter one. Chapter two will be that person's father's direct paternal direct line, possibly mentioning all children of each direct paternal ancestor.
Arrangements of chapters after that second chapter are varied, and can even be alphabetical - or follow the numbering system this article refers to. If they are not alphabetical, there is a Contents page showing each line, plus, in most cases, an index. I think alphabetical makes as much sense as a numbering system that most people won't understand. If you see these books in libraries, they do not use numbering systems. They just rely on the contents to identify the lines and an index to find people.
This is what I want to see added to FTM. A direct line descendant chart for each line until each line "daughters out", ie the daughter marries a man. Then, one goes tot the chapter of the paternal line of that man. One can then go up or down that male's line until that line "daughters out".
If it comes with some esoteric numbering system, fine - although I'd like to have the capability to simply turn it off. This type of ancestor arrangement has been going for at least two hundred years and it is amazing that modern genealogy programs ignore it.
One can try to jerry-rig such a presentation in an FTM book, but when one has over 200 separately identified American immigrants and therefore 200 lines, that becomes a bit of a chore - and since the Descendant Regiester Report can't (yet) be done on a direc line basis, is almost impossible to pull off.
An accompanying request I make with this one each year is the capability to do Direct Line Descendant Register Reports. We can now do direct line outline descendant reports as well as charts - but not register reports.