Guess every people has their own way of quarantine their fishes.
I personally saw 1 LFS , dipped their newly arrived fish in copper solution in a pail, let them stay there for few minutes, then remove and just put it into partition tank.
And their fishes are really doing well. Dun ask why, haha.
The point is that, its up to us to decide which method to use.
Agruing who's right, who's wrong, would not resolve anything.
Anyway, nice info in this thread.