Sorry to burst your bubble, but you are making things up. The American Birding Association, the top U.S. bird listing association, allows heard only birds on their life lists. (
ABA Recording Rules and Interpretations - American Birding Association--"For a first encounter with a species, no matter which list is involved, identification may be by sight or sound"). That has been their policy for years. (Though I know you will just think this supports your view that American birders, and others who count heard-onlies, are "lazy."😆)
In any event, I wasn't making an empirical claim about what people do. Only way to know that is via a poll. I was referencing establishing a principle that seeing the bird is required--such as via the ABA--which would encourage people to take extraordinary steps even if they don't want to.