Not a waste of time, once the infestation has happened, with fish in the tank you will never be able to fight them off, it will eventually take your fish. But that's why they are saying to run the tank free of fish to allow the life cycle to run it's course, And in the hospital tank you will need to medicate the fish to rid them of the parasite aswell!
On the main page it an archived section that so really good folks have put together trying to help us all!
https://forums.saltwaterfish.com/f/
As i was saying before, I personally think that this parasite lives in all fish, just not at a high enough rate to kill them ( in the wild) But once it has the confined spaces of our tanks, it is now allowed to build up in greater numbers!
So with that said, ( as i was saying before) once you have the infestation , you will have to QT and med your fish, BUT you still have solve the issue of what is causing the stress that is in turn causing the outbreak!
Again, I am by no means an expert, I am only going by what i have read, there is some personal experiance thrown in, I have dealt with ick and won, I had to reduce the amount of fish i was keeping, I can now enjoy my tank without alot of stress myself !
Shesh, that requires way to much thinking so early in the morning!