While I build however the client wants, even my own personal 8wt has single foot zirconium guides on it, and has never posed a single issue. My wife's new SHX 9' 5wt that I am building her for the San Juan next month will even have minima single foots on it. A lot of it I feel is just strictly personal preference, and asthetics to most people, just like the fact that you really do not need more than 3 sizes of guides on a build.