I still would like to see peer reviewed studies from reputable veterinarians first.
Please go find them and share them with us so we can all benefit. I am sure there are many more people reading this and wanting to know then those who are commenting.
I would also like to add that vets are not necessarily the experts on all things bird. Knowledge abounds in many areas and much of it resides in the minds and experiences of those who live with birds everyday. How do you know you are not talking to a biologist or a vet or a vet tech or a breeder who has watched and researched the entire life cycle of a particular species? Better to ask and listen then the insist that a knowledgeable person, perhaps even one with credentials from academia, shouldn't be taken seriously because his comments had not been peer reviewed.
I totally appreciate the need to vet the info you receive but anecdotal evidence interpreted by and experienced bird keeper, backed up by years of first hand experience and stories gathered from fellow bird keepers over years is a very valuable thing. I've seen people leave groups or stop giving advice to people all together because they are insulted or ignored. It's a shame really.
I've been there. It's not pretty.
Nobody is policing what you choose to do but the advice you have been given is solid. After 10, 20, 30 or 40 years, a person may not remember where they heard or read something but if they have a reputation for providing accurate advice, being well read, and experienced and a good steward or their birds, then what they say should at least be cause for personal research on the part of the one with the question.
I'm not sure why this thread has me feeling like I need to take a side. We should all be on the same side. Our bird's side.