It's quite the debate going on here. I can see both sides of this one. The theory is there that you can achieve a system that has no ich. And that is not a hard concept to achieve. Simply strict qt'ing. The only problem is that you have to also qt all inverts and coral for 8 weeks not everyone is set up to do this.
And I will agree that what works for Mr x will not work for everyone due to the fact that he has much more knowledge and has done more research than most of us. His decisions have kept his tank stress free. Good for him. Although if something catastrophic happens to his tank the parasite has the ability to take over and seriously cripple his fish.
Both methods have their pros and cons. IMO
neither should be considered wrong.