Managing honeybee diseases is managing diseaseses. It is not treating opinions.
There are enough bee disease science and we should know what the disease and how to treat it. But even to skillfull persons things are sometimes difficult.
Lets take Scientific beekeeper Randy Oliver from California. He is not convinced, how oxalic acid trickling works. But however the method has worked in Italy 23 years and in many other European countries 20 years. It works when the colony is broodless. Some guys insist still that it does not work. Not to mention Mr Hivemaker...
But I know that is does not work alone. You must treat the colony before it rears winter bees. And so on...
Sometimes California has 26C yemps in September and Hivemaker has pollen plants in January. No wonder that method does not work.