Guy wires take ten to twenty times less time then normal wiring! In less than half an hour I can put the branches where I want them with guy wires. Guy wires can be changed and removed in seconds. But they should mostly be used on already styled trees for further development. At first styling I usually use orthodox wiring. Guy wires tend to do less damage than regular wiring. They are ugly, but only for a short time. I believe that guy wires should be used much more.
Methods can only be judged according to long term results and effects. They cannot be judged on what is 'normal', 'state of the art', 'orthodox'. Who has the better results has the better methods.