The S hook isn't a bad method at all especially if you like doing one piece. But with Prince rackets it may be hard to run in the top one or two crosses with the short side and avoid sharp sections of frame on the long side. Therefore you will probably have to tie out the short side outside main.
I have never used the S hook method but I would think with the pin grommets the hook could damage the grommets.
Everyone has the right to be stupid... it's just that some people abuse the privilege