From my perspective as a new-bee, it seems like all parties in discussion here could be correct because they are speaking from their experience in their particular part of the world with their species and disposition of bees using their techniques, all of which differ from one another (slightly to greatly).
I am going to follow Michael Bush's recommendations to start with because they resound with my desire to keep bees with as little antibiotics as possible. I realize my bees may have problems or fail, not necessarily because Mr. Bush's recommendations are bad but possibly because of other factors, like my inexperience, or the part of the world I'm in, or my bees.
However, I hope to keep learning and raise my bees as organically (naturally?) as possible. I may need to use some treatments, and I do not close the door on that.
In short, what works for some beekeepers may not work for others because there are so many different factors, though trends can be seen which may apply to all to one degree or another (varroa mites as an example), and these are important to understand and adapt to your specific case.
Godspeed to you in your beekeeping! My first bees are coming in 2 months and a week, and I'm excited.