David, that works if you have FOWLR tank, or a tank with no inverts who will suffer from it. In my case, there were a multitude of reasons for the dinos taking hold and then exploding in growth. Yes, after fixing them we did notice a marked improvement, however, if the corals were still in there we'd have lost every single one of them...
Its like using chemicals to treat cyano bacteria. I dont believe in using them to treat the problelm but to get an upperhand on the problem while you fix the husbandry skills that works. (By the way, not going to get into that argument here, its been done before).
If I had tried, as you stated, to improve my husbandry skills while maintaining the tank as-is, you;d have seen someone very upset with the help given online because I;d have lost nearly $1,200 worth of corals. But putting a bit more effort into it, fixing my husbandry skills, I lost a $5 stalk of xenia. I think my method works out better because in the end, the husbandry skills were improved, I learned from my mistake, and didnt lose too much doing it (Oh and about $30 worth of snails I lost as well).