That's probably the main reason why people keep rephrasing this same advice all the time. Even though many others have said the same thing before the author X g

That's probably the main reason why people keep rephrasing this same advice all the time. Even though many others have said the same thing before the author X got to it, he or she has seen all that stuff misinterpreted and used as an excuse for shoddy work. So naturally the author X decides to tell it again, but this time in an even clearer way. Redundancy out of optimism ;)