Sorry to be blunt, but there is a real reason the idiom existed for several hundred years. Perhaps you should read the book so we can have more civilized discussions?
That's fair enough but to simply dismissed a book by the fact that it's written by some qualified and professional company engineers is not acceptable. To be honest there are only two books on segment routing at the moment both are over $100, just trying to be helpful on the book because the recommended one is what I have. Here is the main website for segment routing for the IETF documents, software, papers, etc: